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08/30/25 at 08:57:52

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Rachael Problem - Pop and Bias Meter to 100 (Read 214 times)

Alan Arkin

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Posts: 41

Rachael Problem - Pop and Bias Meter to 100
08/28/25 at 14:39:35

Hi there -

So this morning when I powered on my system as I always do, after a few moments, I realized that there was a dull pop coming from the right speaker. (It took me a minute to realize this). When I went over to the system, I saw that the right meter was at 100. I turned my system off and checked that all the tubes and connections were as they should be. (I had just dusted and thought maybe I nudged something). I tried again and it happened again, and once more, and it still happened. When it turned on it looked like the bias meter went to 40 and then jumped to 100 a few moments later.

Any idea what this could be? I guess I will swap out the tubes -- though not sure if that would be the power tube or the input tube. But is it likely to be something other than tubes?

Thanks.

-- Alan

SE34i.5 (With 2nd Anniv. Mods); Aric Custom S6N7 Line Stage; Rega Planar 6 (With Apheta 3 Cart. and Groovetracer Subplatter and Counterweight); Darlington Labs MP-8B and SU-7; Omega Super Alnico High Output XRS; 2 Rel T/5x; Gaia III; 3" Maple Butcher Block Platfor

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CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2728	Re: Rachael Problem - Pop and Bias Meter to 100 Reply #1 - 08/28/25 at 15:00:22 Quote: Posted by: Alan Arkin Posted on: Today at 06:39:35 ...Any idea what this could be? Tubes. The meter reads the current on the power tube so that is where I'd start, then the rectifier and then the input tube.
Back to top	[FOOBAR2000 \| Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos Omega SAM , Hifiman Arya, Audeze LCD-XC IP Logged

Alan Arkin Verified Member Posts: 41	Re: Rachael Problem - Pop and Bias Meter to 100 Reply #2 - 08/28/25 at 15:26:16 Thanks. I think it was a bad KT77. I swapped out my power tubes and the meters are holding steady at 40. So crisis averted.
Back to top	SE34i.5 (With 2nd Anniv. Mods); Aric Custom S6N7 Line Stage; Rega Planar 6 (With Apheta 3 Cart. and Groovetracer Subplatter and Counterweight); Darlington Labs MP-8B and SU-7; Omega Super Alnico High Output XRS; 2 Rel T/5x; Gaia III; 3" Maple Butcher Block Platfor IP Logged

CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2728	Re: Rachael Problem - Pop and Bias Meter to 100 Reply #3 - 08/28/25 at 15:54:23 Happy to help. I think it is safe to say when something different/strange/bad happens to the amp your first, and probably second thought should be "tubes." After that there are things like fuses and heatwave related power sags to consider.
Back to top	[FOOBAR2000 \| Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos Omega SAM , Hifiman Arya, Audeze LCD-XC IP Logged

Alan Arkin Verified Member Posts: 41	Re: Rachael Problem - Pop and Bias Meter to 100 Reply #4 - 08/28/25 at 16:05:20 And now on to shopping for a new set of power tubes!
Back to top	SE34i.5 (With 2nd Anniv. Mods); Aric Custom S6N7 Line Stage; Rega Planar 6 (With Apheta 3 Cart. and Groovetracer Subplatter and Counterweight); Darlington Labs MP-8B and SU-7; Omega Super Alnico High Output XRS; 2 Rel T/5x; Gaia III; 3" Maple Butcher Block Platfor IP Logged

Yakatak Verified Member Posts: 49	Re: Rachael Problem - Pop and Bias Meter to 100 Reply #5 - Yesterday at 02:12:56 NOS 807 :)
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