tube synth diy

Hey all... I'm new here, though I haunt AH and SDIY now and again (reckon there's some overlap between people on this list and those).

I'm looking to build some of Eric Barbour's designs from Ken Stone's site, and was wondering about how hefty my coupling capacitors should be.

Seems that caps in other tube designs, synths or amps etc., are chosen based on minimum DC voltage x 2, what's available in standard rating values, and what physically fits in the layout/enclosure.

That sound about right? Or am in "If you have to ask, you shouldn't try it yet" territory?


_Kyle

The "greater than the DC voltage it will see, plus at least 20% spare" would
be the first rule. Be aware that a capacitor can see more than the power
rail voltage in some circumstances (i.e charged in one direction, then
having the opposite voltage applied it). Double the DC voltage is good. The
value specified on the circuit diagram (if present) is ideal.

Ken
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

I see - makes sense. Eric's designs didn't have a rating otherwise I'd have gone by that. Even if they were there, knowing 'why' is good too.

A follow up capacitor question: the big electrolytics I picked up for my power supply, as per the design on your site Ken, from physical inspection at least seem recent enough (ranging from ~5-30 years old), though should I bother reforming them? Could I do that while burning in the fully built supply, slowly raising the input voltage to 120V?

My thanks sir!


_Kyle

--- On Fri, 6/18/10, sasami@... <sasami@...> wrote:

From: sasami@... <sasami@...>
Subject: Re: [tubesynthdiy] Capacitor Voltage Ratings
To: tubesynthdiy@yahoogroups.com
Date: Friday, June 18, 2010, 4:54 PM

 

The "greater than the DC voltage it will see, plus at least 20% spare" would
be the first rule. Be aware that a capacitor can see more than the power
rail voltage in some circumstances (i.e charged in one direction, then
having the opposite voltage applied it). Double the DC voltage is good. The
value specified on the circuit diagram (if present) is ideal.

Ken
__________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

If they have been sitting around unused for many years, yes reforming would
be a good idea. I so no reason why you can't do it in the supply - as you
say, raising the voltage slowly over time. The reason for that is to stop
heat build-up that could damage them.
I'm sure there is a lot more on reforming on the web, alond with some
reforming circuits, from people with a lot more experience on the subject
than me.

Ken

>I see - makes sense. Eric's designs didn't have a rating otherwise I'd have

gone by that. Even if they were there, knowing 'why' is good too.

>
>A follow up capacitor question: the big electrolytics I picked up for my

power supply, as per the design on your site Ken, from physical inspection
at least seem recent enough (ranging from ~5-30 years old), though should I
bother reforming them? Could I do that while burning in the fully built
supply, slowly raising the input voltage to 120V?

>
>My thanks sir!
>
>
>_Kyle
>
>--- On Fri, 6/18/10, sasami@... <sasami@...> wrote:
>
>From: sasami@... <sasami@...>
>Subject: Re: [tubesynthdiy] Capacitor Voltage Ratings
>To: tubesynthdiy@yahoogroups.com
>Date: Friday, June 18, 2010, 4:54 PM
>
>
>
>
>
>
>
> 
>
>
>
>
>
>
>
>
>
> The "greater than the DC voltage it will see, plus at least 20%

spare" would

>
>be the first rule. Be aware that a capacitor can see more than the power
>
>rail voltage in some circumstances (i.e charged in one direction, then
>
>having the opposite voltage applied it). Double the DC voltage is good. The
>
>value specified on the circuit diagram (if present) is ideal.
>
>
>
>Ken
>
>__________________________________________________________
>
>Ken Stone sasami@... otherunicorn@...
>
>Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>
>Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
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style="font: inherit;">I see - makes sense. Eric's designs didn't have a
rating otherwise I'd have gone by that. Even if they were there, knowing
'why' is good too.<br><br>A follow up capacitor question: the big
electrolytics I picked up for my power supply, as per the design on your
site Ken, from physical inspection at least seem recent enough (ranging from
~5-30 years old), though should I bother reforming them? Could I do that
while burning in the fully built supply, slowly raising the input voltage to
120V?<br><br>My thanks sir!<br><br><br>_Kyle<br><br>--- On <b>Fri, 6/18/10,
sasami@... <i><sasami@...></i></b>
wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255);
margin-left: 5px; padding-left: 5px;"><br>From: sasami@...
<sasami@...><br>Subject: Re: [tubesynthdiy] Capacitor
Voltage Ratings<br>To:

> tubesynthdiy@yahoogroups.com<br>Date: Friday, June 18, 2010, 4:54

PM<br><br><div id="yiv2065612811">

>
>
>
>
>
><span style="display: none;"> </span>
>
>
>
> <div id="ygrp-text">
>
>
> <p>The "greater than the DC voltage it will see, plus at least 20%

spare" would<br>

>be the first rule. Be aware that a capacitor can see more than the power<br>
>rail voltage in some circumstances (i.e charged in one direction, then<br>
>having the opposite voltage applied it). Double the DC voltage is good. The<br>
>value specified on the circuit diagram (if present) is ideal.<br>
><br>
>Ken<br>
>__________________________________________________________<br>
>Ken Stone <a rel="nofollow" ymailto="mailto:sasami%40hotkey.net.au"

target="_blank"
href="/mc/compose?to=sasami%40hotkey.net.au">sasami@...</a> <a
rel="nofollow" ymailto="mailto:otherunicorn%40virginbroadband.com.au"
target="_blank"
href="/mc/compose?to=otherunicorn%40virginbroadband.com.au">otherunicorn@vir
ginbroadband.com.au</a><br>

>Modular Synth PCBs for sale <<a rel="nofollow" target="_blank"

href="http://www.cgs.synth.net/">http://www.cgs.synth.net/</a>><br>

>Australian Miniature Horses & Ponies <<a rel="nofollow"

target="_blank"
href="http://www.blaze.net.au/%7Esasami/">http://www.blaze.net.au/~sasami/</
a>><br>

><br>
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_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

So I got a variac the other day, which many sites recommend for use with reforming caps.

It's a neat piece of equipment to have lying around too - as the guy who sold it to me said, it has a Frankenstein quality to it.

That said, it's quite old (it's called an "Adjust-A-Volt" if that gives you any idea), and has only two prong connectors for the line in and out.

Should I bother getting one of those two to three prong adapters, like this:

http://ep.yimg.com/ca/I/trianglecables-site_2113_308000194

And tie the ground lug to the chassis? And tie that to the wall outlet ground as well then?


_Kyle

--- On Sat, 6/19/10, sasami@... <sasami@...> wrote:

From: sasami@... <sasami@...>
Subject: Re: [tubesynthdiy] Capacitor Voltage Ratings
To: tubesynthdiy@yahoogroups.com
Date: Saturday, June 19, 2010, 12:48 AM

 

If they have been sitting around unused for many years, yes reforming would
be a good idea. I so no reason why you can't do it in the supply - as you
say, raising the voltage slowly over time. The reason for that is to stop
heat build-up that could damage them.
I'm sure there is a lot more on reforming on the web, alond with some
reforming circuits, from people with a lot more experience on the subject
than me.

Ken

>I see - makes sense. Eric's designs didn't have a rating otherwise I'd have
gone by that. Even if they were there, knowing 'why' is good too.
>
>A follow up capacitor question: the big electrolytics I picked up for my
power supply, as per the design on your site Ken, from physical inspection
at least seem recent enough (ranging from ~5-30 years old), though should I
bother reforming them? Could I do that while burning in the fully built
supply, slowly raising the input voltage to 120V?
>
>My thanks sir!
>
>
>_Kyle
>
>--- On Fri, 6/18/10, sasami@... <sasami@...> wrote:
>
>From: sasami@... <sasami@...>
>Subject: Re: [tubesynthdiy] Capacitor Voltage Ratings
>To: tubesynthdiy@yahoogroups.com
>Date: Friday, June 18, 2010, 4:54 PM
>
>
>
>
>
>
>
> 
>
>
>
>
>
>
>
>
>
> The "greater than the DC voltage it will see, plus at least 20%
spare" would
>
>be the first rule. Be aware that a capacitor can see more than the power
>
>rail voltage in some circumstances (i.e charged in one direction, then
>
>having the opposite voltage applied it). Double the DC voltage is good. The
>
>value specified on the circuit diagram (if present) is ideal.
>
>
>
>Ken
>
>__________________________________________________________
>
>Ken Stone sasami@... otherunicorn@...
>
>Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>
>Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
>
>
>
>
>
>
>
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><!--
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> clear: both;
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> float: left;
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> font-weight: normal;
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> /* end of attachment style */
> -->
> </style>
> </head>
><html>
><head>
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><!--
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> border: 1px solid #d8d8d8;
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><table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top"
style="font: inherit;">I see - makes sense. Eric's designs didn't have a
rating otherwise I'd have gone by that. Even if they were there, knowing
'why' is good too.<br><br>A follow up capacitor question: the big
electrolytics I picked up for my power supply, as per the design on your
site Ken, from physical inspection at least seem recent enough (ranging from
~5-30 years old), though should I bother reforming them? Could I do that
while burning in the fully built supply, slowly raising the input voltage to
120V?<br><br>My thanks sir!<br><br><br>_Kyle<br><br>--- On <b>Fri, 6/18/10,
sasami@... <i>&lt;sasami@...&gt;</i></b>
wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255);
margin-left: 5px; padding-left: 5px;"><br>From: sasami@...
&lt;sasami@...&gt;<br>Subject: Re: [tubesynthdiy] Capacitor
Voltage Ratings<br>To:
> tubesynthdiy@yahoogroups.com<br>Date: Friday, June 18, 2010, 4:54
PM<br><br><div id="yiv2065612811">
>
>
>
>
>
><span style="display: none;">&nbsp;</span>
>
>
>
> <div id="ygrp-text">
>
>
> <p>The "greater than the DC voltage it will see, plus at least 20%
spare" would<br>
>be the first rule. Be aware that a capacitor can see more than the power<br>
>rail voltage in some circumstances (i.e charged in one direction, then<br>
>having the opposite voltage applied it). Double the DC voltage is good. The<br>
>value specified on the circuit diagram (if present) is ideal.<br>
><br>
>Ken<br>
>__________________________________________________________<br>
>Ken Stone <a rel="nofollow" ymailto="mailto:sasami%40hotkey.net.au"
target="_blank"
href="/mc/compose?to=sasami%40hotkey.net.au">sasami@...</a> <a
rel="nofollow" ymailto="mailto:otherunicorn%40virginbroadband.com.au"
target="_blank"
href="/mc/compose?to=otherunicorn%40virginbroadband.com.au">otherunicorn@vir
ginbroadband.com.au</a><br>
>Modular Synth PCBs for sale &lt;<a rel="nofollow" target="_blank"
href="http://www.cgs.synth.net/">http://www.cgs.synth.net/</a>&gt;<br>
>Australian Miniature Horses &amp; Ponies &lt;<a rel="nofollow"
target="_blank"
href="http://www.blaze.net.au/%7Esasami/">http://www.blaze.net.au/~sasami/</
a>&gt;<br>
><br>
></p>
>
> </div>
>
>
>
>
>
>
>
></div></blockquote></td></tr></table><br>
>
>
>
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>
><!-- |**|begin egp html banner|**| -->
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><br>
>
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><br>
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><!-- |**|end egp html banner|**| -->
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><div width="1" style="color: white; clear: both;"/></div>
></body>
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></html>
>
__________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

yes an earth connection is a very good idea!

--- In tubesynthdiy@yahoogroups.com, Kyle Stephens <lightburnx@...> wrote:
>
> So I got a variac the other day, which many sites recommend for use with reforming caps.
>
> It's a neat piece of equipment to have lying around too - as the guy who sold it to me said, it has a Frankenstein quality to it.
>
> That said, it's quite old (it's called an "Adjust-A-Volt" if that gives you any idea), and has only two prong connectors for the line in and out.
>
> Should I bother getting one of those two to three prong adapters, like this:
>
> http://ep.yimg.com/ca/I/trianglecables-site_2113_308000194
>
> And tie the ground lug to the chassis? And tie that to the wall outlet ground as well then?
>
>
> _Kyle
>
> --- On Sat, 6/19/10, sasami@... <sasami@...> wrote:
>
> From: sasami@... <sasami@...>
> Subject: Re: [tubesynthdiy] Capacitor Voltage Ratings
> To: tubesynthdiy@yahoogroups.com
> Date: Saturday, June 19, 2010, 12:48 AM
>
>
>
>
>
>
>
> Â
>
>
>
>
>
>
>
>
>
> If they have been sitting around unused for many years, yes reforming would
>
> be a good idea. I so no reason why you can't do it in the supply - as you
>
> say, raising the voltage slowly over time. The reason for that is to stop
>
> heat build-up that could damage them.
>
> I'm sure there is a lot more on reforming on the web, alond with some
>
> reforming circuits, from people with a lot more experience on the subject
>
> than me.
>
>
>
> Ken
>
>
>
> >I see - makes sense. Eric's designs didn't have a rating otherwise I'd have
>
> gone by that. Even if they were there, knowing 'why' is good too.
>
> >
>
> >A follow up capacitor question: the big electrolytics I picked up for my
>
> power supply, as per the design on your site Ken, from physical inspection
>
> at least seem recent enough (ranging from ~5-30 years old), though should I
>
> bother reforming them? Could I do that while burning in the fully built
>
> supply, slowly raising the input voltage to 120V?
>
> >
>
> >My thanks sir!
>
> >
>
> >
>
> >_Kyle
>
> >
>
> >--- On Fri, 6/18/10, sasami@... <sasami@...> wrote:
>
> >
>
> >From: sasami@... <sasami@...>
>
> >Subject: Re: [tubesynthdiy] Capacitor Voltage Ratings
>
> >To: tubesynthdiy@yahoogroups.com
>
> >Date: Friday, June 18, 2010, 4:54 PM
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >ÂÂ
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > The "greater than the DC voltage it will see, plus at least 20%
>
> spare" would
>
> >
>
> >be the first rule. Be aware that a capacitor can see more than the power
>
> >
>
> >rail voltage in some circumstances (i.e charged in one direction, then
>
> >
>
> >having the opposite voltage applied it). Double the DC voltage is good. The
>
> >
>
> >value specified on the circuit diagram (if present) is ideal.
>
> >
>
> >
>
> >
>
> >Ken
>
> >
>
> >__________________________________________________________
>
> >
>
> >Ken Stone sasami@... otherunicorn@...
>
> >
>
> >Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>
> >
>
> >Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
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> >
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> >
>
> >
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> >
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> >
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> >
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> >
>
> >
>
> >
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> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> ><head>
>
> >
>
> ><style type="text/css">
>
> ><!--
>
> >
>
> >/* start of attachment style */
>
> > .ygrp-photo-title{
>
> > clear: both;
>
> > font-size: smaller;
>
> > height: 15px;
>
> > overflow: hidden;
>
> > text-align: center;
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> > width: 75px;
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> > div.ygrp-photo{
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> > border: 1px solid black;
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> > }
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> >
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> > div.attach-table div.attach-row {
>
> > clear: both;
>
> > }
>
> >
>
> > div.attach-table div.attach-row div {
>
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> style="font: inherit;">I see - makes sense. Eric's designs didn't have a
>
> rating otherwise I'd have gone by that. Even if they were there, knowing
>
> 'why' is good too.<br><br>A follow up capacitor question: the big
>
> electrolytics I picked up for my power supply, as per the design on your
>
> site Ken, from physical inspection at least seem recent enough (ranging from
>
> ~5-30 years old), though should I bother reforming them? Could I do that
>
> while burning in the fully built supply, slowly raising the input voltage to
>
> 120V?<br><br>My thanks sir!<br><br><br>_Kyle<br><br>--- On <b>Fri, 6/18/10,
>
> sasami@... <i>sasami@...</i></b>
>
> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255);
>
> margin-left: 5px; padding-left: 5px;"><br>From: sasami@...
>
> sasami@...<br>Subject: Re: [tubesynthdiy] Capacitor
>
> Voltage Ratings<br>To:
>
> > tubesynthdiy@yahoogroups.com<br>Date: Friday, June 18, 2010, 4:54
>
> PM<br><br><div id="yiv2065612811">
>
> >
>
> >
>
> >
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> >
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> >
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> ><span style="display: none;"> </span>
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> >
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> >
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> >
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> > <div id="ygrp-text">
>
> >
>
> >
>
> > <p>The "greater than the DC voltage it will see, plus at least 20%
>
> spare" would<br>
>
> >be the first rule. Be aware that a capacitor can see more than the power<br>
>
> >rail voltage in some circumstances (i.e charged in one direction, then<br>
>
> >having the opposite voltage applied it). Double the DC voltage is good. The<br>
>
> >value specified on the circuit diagram (if present) is ideal.<br>
>
> ><br>
>
> >Ken<br>
>
> >__________________________________________________________<br>
>
> >Ken Stone <a rel="nofollow" ymailto="mailto:sasami%40hotkey.net.au"
>
> target="_blank"
>
> href="/mc/compose?to=sasami%40hotkey.net.au">sasami@...</a> <a
>
> rel="nofollow" ymailto="mailto:otherunicorn%40virginbroadband.com.au"
>
> target="_blank"
>
> href="/mc/compose?to=otherunicorn%40virginbroadband.com.au">otherunicorn@vir
>
> ginbroadband.com.au</a><br>
>
> >Modular Synth PCBs for sale <<a rel="nofollow" target="_blank"
>
> href="http://www.cgs.synth.net/">http://www.cgs.synth.net/</a>><br>
>
> >Australian Miniature Horses & Ponies <<a rel="nofollow"
>
> target="_blank"
>
> href="http://www.blaze.net.au/%7Esasami/">http://www.blaze.net.au/~sasami/</
>
> a>><br>
>
> ><br>
>
> ></p>
>
> >
>
> > </div>
>
> >
>
> >
>
> >
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> >
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> >
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> >
>
> >
>
> ></div></blockquote></td></tr></table><br>
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> >
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> >
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> >
>
> __________________________________________________________
>
> Ken Stone sasami@... otherunicorn@...
>
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>