Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Stevewdewitt on May 12, 2020, 10:41:00 pm

Title: no vibrato fender vibroverb
Post by: Stevewdewitt on May 12, 2020, 10:41:00 pm

Hello,
I have come into possession of what I think is a 63ish Fender Vibroverb. It was in rough shape. Recapped the electrolytics. The reverb tank needs help. the reverb works fine with a new tank. The vibrato isn't working. The thing was modded heavily around the vibrato section of the amp. I put it all back to stock. Voltages on the tube are really close to the voltages on the schematic. I had to replace the roach it was in bad shape. I replaced the caps for the tremolo. I have traced this out and it seems fine.

I have a pedal I made for another amp that I used for the vibrato pedal. The tremolo still doesn't work. I replaced the tube with a new 12ax7.

I attached some photos.

TIA,
Steve

Title: Re: no vibrato fender vibroverb
Post by: Stevewdewitt on May 12, 2020, 10:52:44 pm

Some before photos so you can get an idea of what I was dealing with.

I have played it and it sounds good. I haven't gotten to turn it up.

Title: Re: no vibrato fender vibroverb
Post by: vampwizzard on May 12, 2020, 11:40:52 pm

Its come a long way! great restoration.

As far as the trem circuit goes: assuming the wiring is correct etc, some of the blackfaces need a shorting jack in lieu of the proper footswitch: https://www.youtube.com/watch?v=C6jGHPS-Zhw (https://www.youtube.com/watch?v=C6jGHPS-Zhw)

If youre not using the original style footswitch who knows if its wired right.

Good luck!

Title: Re: no vibrato fender vibroverb
Post by: Stevewdewitt on May 13, 2020, 08:01:45 am

I will give it a try

thanks

Title: Re: no vibrato fender vibroverb
Post by: Stevewdewitt on May 13, 2020, 01:37:33 pm

Fixed it. I mistakenly put a .002 cap in place of the .02 cap.

thanks,
Steve

Title: Re: no vibrato fender vibroverb
Post by: vampwizzard on May 13, 2020, 07:49:31 pm

hey now! even better that you figured it out. 

Take a video of the thing playing? Havent seen too many vibroverbs in the wild.