Grid leak biasing

[makinrose]

Hello Citizens!

As they used to say, "All roads lead to Cheops".

Al'likaa' (Goodbye)

Some say "All leads lead to a Marshall"

I imagine those would be people who are already deaf from playing Marshalls or who have never actually played one?
Or in this modern era, are so conditioned by ipod sound that Marshall sounds acceptable?

Waaaay back, a friend and I rented a Marshall head and cabinet to try out. We opened it up and traced the circuit and played it with different guitars, basses and effects. It sounded really dreadful. So much IM and harshness! I can't say I've ever heard a stock Marshall that sounded good.

Regarding the Supro: Those old amps like Supro and Gibson et al often had multiple inputs for different instruments, microphones, accordians, phono players with crystal cartridges, intending for the amp to be a portable PA system for the whole band. So, lots of tubes. Then add tremolo or reverb and the tube count rises. 6973 you can deal with more or less like a 6BQ5-EL84 as far as OTs go. Speakers were often quite generic low-watt "full-range" types.

Remember that the old speakers are well broken-in by now and a new driver will sound comparatively hard and lifeless.

Have fun

First off nice work!! I'm sure they sound great.

I also wanted to reply to Kevin's comments on Marshalls. I'm not sure what models he is referring to (maybe all of them?) the comments seem strident but only because they fly in face of what players are told. I think players are so nuts about them because their heroes played them and magazines tell them they sound good.  Most modern Marshalls really sound terrible and I dread having to work on them because they  are so poorly built.  They don't really sound like the older Marshall amps either. 

The last Marshall amps I liked were the JCM 800s and they really require some mods to keep them from sounding harsh and  play at reasonable volumes. The non-master Plexi amps can sound fantastic (just my subjective taste) for certain things  but they are so damn loud no one can play them safely without some sort of way to control the volume (power scaling is the best way to go!). 

When building vintage Marshall type amps for folks what I'm really doing is building them an amp that sounds like the Marshall sound they have in their head rather than a amp the is cumbersome to use and ear splitting in person.