[sdiy] OT: 2x6CG7 (or other dual medium/low-mu triodes) as bridge rectifiers?

[anthony]

Oh no no no! The last thing I said when I mentioned about the realtime 
arpeggiator was just a comment on how I've been posting a lot about tube 
circuits lately and not much about Synth-DIY.

But what do you think about using 4 triode sections (with the grids tied to 
the cathodes) as a bridge rectifier?

>I would be very interested in the performance controller idea.  I
> think the temptation to just do the same thing except with tubes is
> not a great notion.  Harnessing the power, quirks and abilitie of
> tubes for a synthesizer is a freat idea.  Are you thinking sequencer
> or arpegiator with a tube generated voice or as a module ? To me that
> might make a difference.
>
>
>
> On 1/11/08, anthony <aankrom at bluemarble.net> wrote:
>> I think I tried to post a message about this yesterday and it didn't go
>> through.
>>
>> So moving on...
>>
>> Have any of you ever experimented with using 2 dual triodes that can 
>> handle
>> a decent amount of current as a bridge rectifier? I have 2 6CG7's and 2
>> 8CG7's. I thought about using the 8CG7's and use a separate 9VAC 
>> transformer
>> (and make sure it's close to 9VAC, since the 8CG7 is rated for 8.4VAC - a
>> small hi-watt resistor might help...). I have a 300VAC transformer
>> (non-center-tapped so I can't use a normal fullwave rectifier) that I 
>> know
>> can handle a lot of current demand because it powered about 25 tubes like
>> 12AX7's, 12AU7's, 12AT7's, 6EW6's, 6AU6's & 4 EL84's as current amps for
>> voltage regulators.
>>
>> I want to use it for a 20-50 watt amp. I thought about using a big damper
>> like a 6DW4, but I don't have any Novar sockets. I DO have 9-pin 
>> miniature
>> noval sockets though. Of course I could clamp up the 6DW4 and solder wire 
>> to
>> socket pins and use them as flying leads, but if there'd be any great
>> advantage of trying to use triodes as diodes in a bridge, then I'd want 
>> to
>> do that. I mean I think dealing with the halfwave ripple from a big 
>> damper
>> should be fairly simple. I thought a 150uF cap wouldn't be too big for a
>> 6DW4. It's too bad they don't tell you these things in the datasheets 
>> since
>> they assume you'll be using it as a damper in a TV. Maybe a choke would 
>> be a
>> better filter. I want to save my 10H choke, but I think I have a 3H choke
>> with a lot less resistance... But with a bridge I could probably get away
>> with 20uF caps in a couple pi networks...
>>
>> Man I've been having "Valve's on the Brain" for the past few months. I 
>> think
>> it was finding that Bakelite encrusted Wards Airline radio with the 6V6GT
>> and the 5Y3GT that did it.
>>
>> I promise to post a Synth-DIY message soon.
>>
>> Maybe I'll bring up my idea again about using Ken Stone's 74C922-based
>> Pedalboard controller as the core for realtime performance arpeggiator 
>> and
>> maybe even sequencer. I have all of these latches and synchronous 
>> counters
>> around begging for a project like this...
>>
>>
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>>
>
>
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