Fender Princeton Model 5F2

[CJ]

nice clean Tweed Fender, probably about 1955, narrow panel,

in for some noise issues,

 

[CJ]

eyelet board has never been soldered on except for a newer OPT that has been installed,

sounds killer, especially when maxed out!

these things can go for as much as $10,000 so i am not going to do anything to it but bolt the eyelet board down which had come loose and was the source of the popping noise,

to change the caps or plate resistors would be to ruin the resale value,
as would be to snip the "death cap,"

this amp has not been played much, the 100 K carbon comp resistors measured....100 K!

 

[rock soderstrom]

nice clean Tweed Fender, probably about 1955, narrow panel,

in for some noise issues,

Very nice, I'll go and get the popcorn.

 

[CJ]

speaker has been changed but this thing sounds pretty good, 8 ohms, supposed to be 4,

new handle,

 

[rock soderstrom]

Do you have a better photo of the speaker? Jensen Alnico?

 

[CJ]

iron,

 

[CJ]

the speaker says

Quam 8C12M1
270724

 

[rock soderstrom]

MANY thanks. I'm always a bit too slow with my postings.

 

[CJ]

this is the neat part, this 5F2 circuit seems to be a variant of the schematics you see in the books as far as the power supply is concerned, no choke, screen comes off a 10 K resistor,

volume pot is 1 meg linear so you crunch out in a hurry,

i measured the voltages while the amp was plugged into a variac set at 110 V-ac like the old days,

 

[CJ]

just some disorganized sq wave shots at various levels and frequencies, my brain went out for a walk,

 

[rock soderstrom]

Perfect! That seems to be the layout, right? Which manufacturer is the square 0.005uF capacitor between the pots?


Edit: first PSU cap in your amp is a 16uF...

 

[CJ]

this amp was passed down from the original owner to his son,

leftovers

 

[CJ]

Wow, still another variant, looks like a choke model, thanks!

I might have mis-spoke,

the cap between the pots is a Cornel Dublier Mica with the color dots, marked Type 5 USA

the .05 caps are the yellow Astron,

ok, fixed the cap type on the schemo

 

[rock soderstrom]

The leather handle looks a bit too new for the age of the amp IMHO. It was probably replaced. Edit: You've already written that, it's a bit late here.

 

[CJ]

you can see the letters FD poking out on the right side of the board on one of the gut shots,

yes new handle

the amp is very light, the wood dried out which gives it that tone,

 

[CJ]

wrote down some AC voltages, like an idiot i used jack #2 as it is where jack #1 is supposed to be,

but #2 sounds real good on this amp,