Pro Junior IV and R39/R40

Fender Amp Discussion

Moderators: pompeiisneaks, Colossal

Post Reply
Healer amps
Posts: 9
Joined: Thu Feb 16, 2023 7:21 pm

Pro Junior IV and R39/R40

Post by Healer amps »

Hi !
I just got in a Pro Junior and is quit new, and on this one R39 and R40 is elevated and R39 is dead.
I can't find any schematic whit that high R numbers.
Do any of you have a newer schematic for this amp ?


Best regards OJ
Last edited by Healer amps on Thu Jan 30, 2025 9:20 pm, edited 2 times in total.
Stevem
Posts: 4984
Joined: Fri Jan 24, 2014 3:01 pm
Location: 1/3rd the way out one of the arms of the Milkyway.

Re: Pro Junior R39 an R40

Post by Stevem »

I can't locate a schematic for that amp so can you post up a good picture of that section of the board please?
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!

Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Healer amps
Posts: 9
Joined: Thu Feb 16, 2023 7:21 pm

Re: Pro Junior IV and R39/R40

Post by Healer amps »

Thanks for your response Stevem !

Yes is hade to find a schematic for this amp, have written to Fender but have got no answer get.

But I did find a schematic for Blues junior (same out put section as PR)
https://www.guitarscanada.com/cdn-cgi/i ... ng.564096/

They have move to cathode bias on BJ and PJ, so the R39-40 are bias resistors on PJ.

I will probably end up making a Schematic on this one, they have made some changes in the pre amp to .

Best regards OJ
User avatar
martin manning
Posts: 14057
Joined: Sun Jul 06, 2008 12:43 am
Location: 39°06' N 84°30' W

Re: Pro Junior IV and R39/R40

Post by martin manning »

It's not one of these? https://www.google.com/url?sa=t&source= ... IeN21Lw8-f
I don't see R39 or R40.
Healer amps
Posts: 9
Joined: Thu Feb 16, 2023 7:21 pm

Re: Pro Junior IV and R39/R40

Post by Healer amps »

No that is the old schematic, I think the one am looing for is after 2022 like the blues junior i posted.
But Thanks anyway :)

Best regards OJ
Healer amps
Posts: 9
Joined: Thu Feb 16, 2023 7:21 pm

Re: Pro Junior IV and R39/R40

Post by Healer amps »

Hi !

As I mention before I ask Fender to send me a schematic.
Well, after sending 2 mails and 2 weeks later I got A answer :As this is still a current product, the schematics are currently classified.

Like a simple amp like that is a BIG secret !?

Okay, I just make a schematic, no big deal , but I was hoping Fender was more services minded .

Best regards OJ
Post Reply