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Old 31st March 2003, 01:32 PM   #11
TG is offline TG  Ukraine
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I have about 0.2 mV ripple in my 6B4G class A PP (350 V supply, RCLC filter). And I really like it...
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Old 31st March 2003, 02:02 PM   #12
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Default Bragging!

That's just showing off! I think a Quad II has about 10V ripple! Mind you, it's rather cunning in that it filters the supply to g2 of the output tetrodes, so the 10V isn't a problem.
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Old 31st March 2003, 10:34 PM   #13
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Default RE:That's just showing off!

Hi,

For one, the old QIIs sound...err well really old when not modded.

Once modified they sound decent...say acceptable, but never really great.
Most modifications help to reduce the ripple voltage to acceptable levels amongst other shortcomings.

Most of the Leak amps sound way better after an update and much better than the QIIs IMHO.

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Old 1st April 2003, 08:56 AM   #14
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Default Re: RE:That's just showing off!

Quote:
Originally posted by fdegrove
Most of the Leak amps sound way better after an update and much better than the QIIs IMHO.
I agree. I always thought a Quad II sounded slightly woolly compared to a Leak.
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Old 1st April 2003, 08:55 PM   #15
Sjef is offline Sjef  Netherlands
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Ripple in a single ended power amplifier can be higher then in a single ended preamp. My poweramp has about 80mV of ripple with 2*47uF around a 10H choke. That's enough to get the poweramp quiet.

The preamp needed much more filtering. This one is also a single ended transformer coupled amp. I use 22uF - 15H - 150uF - 15H - 150uF there and have a ripple of 6 micro Volt. Anything above 0,5mV ripple was audible because the hum is also amplified again by the poweramp.

My push pull amp is with a ripple of 2,5 Volt deadly quiet.
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Old 1st April 2003, 09:06 PM   #16
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Indeed, my preamp (now listening: Metallica - Master Of Puppets on WJJO) has FWB > 47uF > 330 ohms > 330uF > 680 ohms > 100uF, output (12AU7 CF) is running from the 330uF I think, 12AX7 from the 100uF. Kinda funny on startup, it hums for a moment then goes to baseline.

I should probably up the filter resistors some day..

Tim
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Old 1st April 2003, 09:30 PM   #17
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Default RIPPERS...

Hi,

Quote:
I should probably up the filter resistors some day..
Could be the bleeders aren't low enough in value too.

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Old 1st April 2003, 11:52 PM   #18
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Huh?

Tim
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Old 1st April 2003, 11:54 PM   #19
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Default HuH?

Hi,

Quote:
Could be the bleeders aren't low enough in value too.
Don't see it?
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Old 1st April 2003, 11:57 PM   #20
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Why would more load on the supply lower ripple?

Tim
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