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Old 30th December 2005, 03:32 AM   #11
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Join Date: Mar 2005
Location: USA
Gene, about half of the background hum went away when I grounded the reverb pot at the middle pin. It's certainly playable when I ground it, and I have to say the amp sounds very good! Nice clean tones and the distortion is pretty smooth. Much better than I expected. It will also rattle the windows in my living room with ease!

By the way, in the mp3, the idle buzz sounds like it does in person, but hum created by turning the reverb control makes a deeper bassier hum than it sounds in the clip.

I took a look at the reverb spec calculator, looks pretty cool, but my tank is a 2 spring Belton unit. The Belton is physically longer than the Accutronics 2 spring units. Luckily there is a phone number to Belton in Korea on the unit. I played around flip flopping the grounding and such on the reverb pan with no change.

I would really love to get the reverb hum down and play some guitar. Any more thoughts or suggestions?

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Old 30th December 2005, 03:12 PM   #12
Trout is offline Trout  United States
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Can you post a picture of the inside of the chassis?

My thought is looking at the schematic, Bypass the reverb section. But of course that pretty much depends on the chassis wiring. Is this printed circuit? Tag Board? Point to Point?

If the reverb stage is fully bypassed, Then maybe you can locate the other hum source " IF " there is one.

( Just my opinion )

I never use spring reverbs, They are even in the best amps I have played less than ideal, Noisey,Common source of feedback, And lord knows terrible if the amp is positioned near the drummer on a Knock Down bouncy stage.

I am far from an expert on this, But for recording I use a no effects setup at the amp, And add things like reverb or chorus with Cubase SX recording software. If I am playing out I use effects pedal for what little I ever need.

Rarely do I ever use much reverb, Generally I just breath on the knob at the pedal to take out a bit of the dryness.
Of Course opinions vary on this.

If the reverb stage is fully bypassed, Then maybe you can locate the other hum source " IF " there is one.

Looking at that schematic, I bet that baby has a great clean sound!
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Old 31st December 2005, 06:23 PM   #13
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Join Date: Apr 2004
Location: Philly
Good point. The placement of the reverb transformer and the tnk itself is very important as well.... as is lead dress. Tube reverb in amps is a pain in the A** to get right, but once you get it, you should be fine.
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