- Posted by fshmstr (A) on January 13, 2004 at 07:42:10
In Reply to: I've got 103 dB speakers posted by VoltSecond on January 12, 2004 at 19:30:41:
Volt Second, What are the stratagies for killing this buzz dead. I've got a little of this on my 'mours (simple snubber on diodes) and the same type of buzz on a homebrew pp 6bq5(DC heaters floated off a voltage divider that also serves as a bleeder for the HV rail, also with a small cap across the silicon rectifiers). It's very annoying and any help to fix it is greatly appreciated.
Follow Ups:
- Re: I've got 103 dB speakers - VoltSecond 19:09:15 01/13/04
(2)
- In Reply to: Re: I've got 103 dB speakers posted by fshmstr on January 13, 2004 at 07:42:10:
1. Filament snubber capacitors on driver tube. Very critical in the Paramour.
2. HV snubber
3. .01 uF ceramic cap signal ground (terminal 12) to chassis (13)
4. Filament snubber on 2A3
5. Balance pot trim mod.All my notes are on my Paramour page.
In the other amp, add a UF4007 inseries with the normal diode bridge.
Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.
- Re: I've got 103 dB speakers - fshmstr 08:19:32 01/14/04
(1)
- In Reply to: Re: I've got 103 dB speakers posted by VoltSecond on January 13, 2004 at 19:09:15:
Thanks Volt Second, I will begin working on the above. For the push pull amp, I assume you mean the diode bridge for the filaments. Does it matter where I put the UF4007? before the filter, or in the ground leg of the bridge? Also I forgot to mention that the DC is on the voltage amp and the splitter/driver (6SN7) only, the power stage is AC heated. (My scrounged power transformer has two 6.3v windings) Thanks again.
- Re: I've got 103 dB speakers - VoltSecond 18:35:35 01/14/04
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- In Reply to: Re: I've got 103 dB speakers posted by fshmstr on January 14, 2004 at 08:19:32:
The UF4006 goes between the rectifier bridge "+" and first capacitor.
Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.
- Re: I've got 103 dB speakers - VoltSecond 18:35:35 01/14/04
(0)
- Re: I've got 103 dB speakers - fshmstr 08:19:32 01/14/04
(1)
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