<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 2 May 2021, at 1:32 am, Nathan Trites <<a href="mailto:nathan@idmclassics.net" class="">nathan@idmclassics.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">Thanks. That’s another thing I wondered about - to what extent do they click/pop under normal conditions.<div class=""><br class=""></div><div class=""> I know it won’t be perfect but the noise is significantly louder than the tones, sounds just this video but on every key <a href="https://youtu.be/NnwJZt3TifI" class="">https://youtu.be/NnwJZt3TifI</a><div class=""><br class=""></div></div></div></blockquote><div><br class=""></div><div><br class=""></div><div>I agree, that low frequency thump heard there is not just key click. And you’re getting that on all keys?</div><div>At least it looks a bit easier to work on than my old Farfisa!!</div><div><a href="https://mezzoauto.blogspot.com/2019/05/farfisa-compact.html" class="">https://mezzoauto.blogspot.com/2019/05/farfisa-compact.html</a></div><div><br class=""></div><div>You seem to have addressed all the things I did in fixing mine - which essentailly got down mainly to replacing 50 year old electrolytics.</div><div>Obviously, you need to see if the supply voltage is sagging with key presses, it might need some attention…</div><div><br class=""></div><div>good luck and keep us informed!</div><div>A</div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><div class=""><div class="">I’ll have time to dig in more tomorrow. </div><div class=""><br class=""></div><div class="">Nathan</div><br class="">On Saturday, May 1, 2021, Michael E Caloroso <<a href="mailto:mec.forumreader@gmail.com" class="">mec.forumreader@gmail.com</a>> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I don't think you can eliminate the noise. Vox combo organs are cheap<br class="">
designs, the contact noise is DC transients when the contacts mate.<br class="">
In an isolated setting you may notice the contact noise, while in a<br class="">
band setting it will be masked out by all the other instruments.<br class="">
<br class="">
Don't expect these to be high fidelity.<br class="">
<br class="">
MC<br class="">
<br class="">
On 4/30/21, Nathan Trites <<a href="mailto:nathan@idmclassics.net" class="">nathan@idmclassics.net</a>> wrote:<br class="">
> Hi all,<br class="">
><br class="">
> I've got a continental v301e here where I'm getting a nasty contact noise<br class="">
> on all keys, which varies in level (seemingly due to where the waveform<br class="">
> falls). It's definitely not just dirty bus bars & j wires, which have been<br class="">
> cleaned pretty aggressively. Most of the finger connections seem good, all<br class="">
> electrolytics replaced, and a few of the (film?) caps replaced for being<br class="">
> open.<br class="">
><br class="">
> With all tone boards in, each bus has an offset of low double digit<br class="">
> millivolts. With a single tone board in it still occurs with an offset in<br class="">
> the single digit mV and it still happens. I've replaced coupling caps in a<br class="">
> few and they still have noise. I can see the spikes on the scope even<br class="">
> without the preamp board installed. Would such a small offset cause popping<br class="">
> like that on the switches?<br class="">
><br class="">
> The continental is a fair bit older than gear I'm used to working on so I'm<br class="">
> still getting my bearings on the construction and haven't checked this yet,<br class="">
> but I suspect the ground from the draw bars or going to the tone boards<br class="">
> needs to be looked at closer. I do get some very low noise on the power<br class="">
> supply (even with nothing installed) again in the 10s of mV range p-p.<br class="">
><br class="">
> Schematics can be found here:<br class="">
> <a href="http://www.theamericannight.com/voxproject/project.html" target="_blank" class="">http://www.theamericannight.<wbr class="">com/voxproject/project.html</a><br class="">
><br class="">
> Any guidance or advice would be appreciated! If anyone knows of a good<br class="">
> transistor organ repair forum or list that would be very helpful too.<br class="">
><br class="">
> Thanks,<br class="">
><br class="">
> Nathan<br class="">
><br class="">
</blockquote></div>
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