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- gain at 9 oclock
- bass at 3 oclock
- mid at 2 oclock
- treble at 12 oclock
- Fx loop jumpered and mix on full
- master about 4 oclock
It’s fairly loud like that with an OCD in front!
The proof that it isn’t is actually written on Denny’s original schematic for it, where it shows the cathode voltage as higher at full power than at idle.
I’m not sure when it was first described as ‘Class A’ - the first reference I saw was in Aspen Pittman’s book, which contains many other errors...
This is why it’s important to understand why it’s wrong.
The characteristic sound of this sort of amp is *because* it’s Class AB and *not* Class A. It’s that rise in the cathode voltage at high power which causes the compression we’re all familiar with. Class A amps do not do that, because one of their characteristics is constant current draw at any power.
Sorry, getting a bit off topic, but this does matter .
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Going to open it up this evening and give it a good clean. Might change the speaker over as well and possible check on the bias, if I'm feeling brave...
@rico Thanks, will try your settings with my tubescreamer.
How likely am I to electrocute myself? Is there anything around these components that could do me any serious damage?
Yes, there are voltages which could do you serious harm around there. The trimmer is in a safer place nearer the front panel.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Where could I buy the bridge rectifier heat sink?
The tech I use is great, and qualified in electronics generally, but really only works on amps as a hobby so probably easier if I source the parts.