FDP Home Page / FDP Forum / FAQ's

The FDP is made possible by the following companies and individual members like you.
Please use the links below to show them we value their sponsorship.

Amplified Parts

Musician's Friend

Advertise here


Apex Tube Matching

Yellowjackets Tube Converters


WD Music

Jensen Loudspeakers

Guitar Center

Antique Electronics Supply

* God bless America and our men and women in uniform *

* Illegitimi non carborundum! *

If you benefit and learn from the FDP and enjoy our site, please help support us and become a Contributing Member or make a Donation today! The FDP counts on YOU to help keep the site going with an annual contribution. It's quick and easy with PayPal. Please do it TODAY!

Chris Greene, Host & Founder



Find musicians
in your area!
  Search the Forums  

FDP Forum / Fender Amps: Vintage (before 1985) / Bandmaster reverb with master volume



Jun 29th, 2016 03:27 PM   Edit   Profile  

Plugged in a guitar, sounds ok. No buzz or extraneous noise.
However, reverb and tremelo do not work. I assume it's tubes, but the master volume pot looked like an aftermarket mod and potential source of the problem until i opened her up.
The wiring looks factory.
I think the tubes might even be original.

Here's some pics of the xformers, chassis wiring and power tube pins.


Once I get the reverb and tremelo back online, what would any of you recommend I do to improve the tone of this amp?
I also own a 69 dripedge bandmaster reverb with awesome tone, so I have a control of sorts.


(This message was last edited by Terryrocks at 05:27 PM, Jun 29th, 2016)

Contributing Member

American Patriot

I'm on guard these days.
Jun 29th, 2016 08:58 PM   Edit   Profile  

You might experiment (check) your preamp tubes. If you have a way to test the tubes, see if all tubes are functioning as they should. Check your bias also.

By the way, what was wrong with the reverb and tremolo? How did you get them working?



Jun 30th, 2016 08:58 AM   Edit   Profile  

I haven't gotten them back working yet, but I do have a 69 dripedge version of the same amp, so I can just borrow it's tubes for reverb and tremelo to see if the circuits are functioning.

Contributing Member

So. Cal. USA

Jun 30th, 2016 09:44 AM   Edit   Profile  

Nice clean chassis, looks to be a '75 model.

I'd make sure the filter and bias caps are fresh. Your chassis pic shows an original bias cap in the amp. If the filters are original replacing them will tighten it up quite a bit.

The most common mod for this amp is to put a Bassman output transformer in it and blackface the power section. The stock tranny is a bit soft to some people and makes the amp sound a bit saggy IMO.

I'd also change it from bias balance to bias adjust or add bias adjust. Grid/plate resistors may be out of spec in the preamp so they and the slope resistors should at least be checked. The condition of the bypass caps should be checked too.

Steve Dallman
Contributing Member

Merrill, Wisconsin

Age is just a number...mine is big
Jul 2nd, 2016 08:12 AM   Edit   Profile  

You know the footswitch has to be used to make the vibrato work? If nothing is shorting the vibrato pedal jack, it won't work.

The most common problems with the reverb are inside the tank. Wires break off, springs let loose. Take the reverb tank out and inspect the insides and check the resistance of the input and output. Check the cables. Plug all back in and continue testing.

While I have found the output transformers of blackface Bandmasters to be easily saturated, that was back in the days of no PA support and high stage volume. I have not found silverface Bandmasters lacking the headroom blackface models did. Today, I'd not be so quick to put in a larger transformer. (In the 60's and 70's I would not have considered gigging with a Deluxe Reverb or a Princeton Reverb. Today, either would be fine for me.)

Contributing Member

Whitehorse Canada

I don't get out much
Jul 2nd, 2016 03:42 PM   Edit   Profile  

The DC resistance of the reverb input should be roughly 1 ohm, output DCR should be roughly 180 ohms. Any readings close will be fine.

If you don't get similar readings, either the tank is buggered or your reverb cables have failed.

FDP Forum / Fender Amps: Vintage (before 1985) / Bandmaster reverb with master volume

Reply to this Topic
Display my email address             Lost your password?
Your Message:
Link Address (URL):
Link Title:

Moderators: Chris Greene  Iron Man  reverendrob  

FDP, LLC Privacy Policy: Your real name, username, and email
are held in confidence and not disclosed to any third parties, sold, or
used for anything other than FDP Forum registration unless you specifically authorize disclosure.

Internet Application Development

Copyright © 1999-2018 Fender Discussion Page, LLC   All Rights Reserved