Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: stringbender.dk on November 08, 2016, 03:54:16 am
-
Hi folks :)
I got my super reverb amp home for some weeks ago. a tech fixed the tremolo for me, so it is working by the power tubes now, with some help from you guys :)
He adjust the bias to 35mA. which should be normal after what I could see on the internet...
BUT, I think it has a bit cold sound. a bit steril. not like the sounds I hear from other people who use a super reverb.
Should the bias be higher?
All the tubes I'm using is from Tube amp doctor.
Some say I should buy NOS tubes, but what difference would that do to the cold sound I hear???
And should I then buy NOS preamp tubes and NOS power tubes???
-
Hi folks :)
I got my super reverb amp home for some weeks ago. a tech fixed the tremolo for me, so it is working by the power tubes now, with some help from you guys :)
He adjust the bias to 35mA. which should be normal after what I could see on the internet...
I assume that "working by the power tubes now" he converted it to bias-vary tremolo, which needs to be a little on the cold side to work well. You might want to change your negative feedback to a higher resistance to get a "warmer" response.
-
Disregard the tremolo and turn it off. Now adjust the bias so the tubes run hotter for a warmer sound. Can you get the sound you want?
-
Well, the tremolo got stronger after the mod. I don't know how to disconnect the tremolo.
and the bias should be as "normal" when it is at 35mA, right?
Do you adjust it higher?
-
Disregard the tremolo and turn it off. Now adjust the bias so the tubes run hotter for a warmer sound. Can you get the sound you want?