Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: plexi50 on October 01, 2011, 03:20:24 pm

Title: Blues Deluxe / Howling
Post by: plexi50 on October 01, 2011, 03:20:24 pm
I just got a Fender Blues Deluxe in this morning. I have completed many barley soldered connections. The worst one i have ever seen so far. After turning the amp on i can play for about 2 minutes lightly. Then make some strong power chords and the amp goes ballistic into what i belive is positive feedback. I looked at the schematic and V4 shows Blue from OT and V5 shows Brown from OT

Well i looked at the board and tube sockets and the wires are reversed. I am fixing to reverse them now and see if that cures it

The cover has never been off the amp as i had to literally pry it off (Snap,Crackle & Pop)

Reversed the OT wires and still have the same howling. Humm
Title: Re: Blues Deluxe / Howling
Post by: Tone Junkie on October 01, 2011, 03:36:03 pm
Its sad when you see how down quality wise fender products have become.  :help:
Bill
Title: Re: Blues Deluxe / Howling
Post by: plexi50 on October 01, 2011, 05:05:20 pm
Yeah it is Tone Junkie. I found the real problem. V2 ribbon cable pin1 & pin 2 broke off and barley touching the tube socket board. When the 12" speaker rattled the cab it would fartout and howl real bad. Thats amp #3 today. Im done. I need a beer. I hate beer but it makes me think about it every now and then
Title: Re: Blues Deluxe / Howling
Post by: phsyconoodler on October 03, 2011, 11:55:44 am
Quote:" barley"

  You really DO have beer on your mind! :l2:
Title: Re: Blues Deluxe / Howling
Post by: plexi50 on October 04, 2011, 11:09:28 am
Quote from: phsyconoodler on October 03, 2011, 11:55:44 am
Quote:" barley"

  You really DO have beer on your mind! :l2:

 :laugh: Man thats the 2nd or 3rd time ive done that recently! I really dont drink but once or twice a year if that.  Should i invest in some hops?