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Mods to 1940's Phono Amp

L**E

Member
Messages
1
I purchased a 1940's Webster Chicago amp that has the same tube compliment as the tweed deluxe. Nice creamy sound. Problem is that it is very, very quiet. Seems crazy that with a 6N7 pre-amp tube and two 6v6's it should be so quiet. Any ideas on how I can mod the amp to pump up the volume?
 

Prairie Dawg

Member
Messages
1,928
I purchased a 1940's Webster Chicago amp that has the same tube compliment as the tweed deluxe. Nice creamy sound. Problem is that it is very, very quiet. Seems crazy that with a 6N7 pre-amp tube and two 6v6's it should be so quiet. Any ideas on how I can mod the amp to pump up the volume?
To start with, a voltage map ought to be on your list of things to do. You'll probably find that a some, if not all, of the capacitors are shot and the resistors have drifted wayyyy out of tolerance. Once you get that under control you can start figuring out where you want to go with it.
 

Keyser Soze

Member
Messages
1,472
Are you sure that it is a 6N7 tube? That's a class B output tube, that can also be wired as a class A output driver. A 6SN7 is the more typical twin triode pre-amp tube (but both are relatively low mu tubes.)

Got a schematic?
 

doc

Silver Supporting Member
Messages
7,410
I've got one of these in the mail, I'll let you know how it turns out for me.
 

doc

Silver Supporting Member
Messages
7,410
Hey, let me know if you turn up a cheap (or preferably free) schematic for this beastie.
 




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