Search found 345 matches

by grtamp
Mon Aug 25, 2014 11:25 am
Forum: Dumble Discussion
Topic: CF question in SSS
Replies: 1
Views: 725

CF question in SSS

Hi , can anyone explain me why the driver Cf in SSS 002 has no coupling cap before 1.5K grid resistor?

sorry for the stupid question!

R.
by grtamp
Mon Aug 25, 2014 8:05 am
Forum: Dumble Discussion
Topic: PT for SSS
Replies: 15
Views: 2416

Re: PT for SSS

Dual professional and Twin Pro Tube use the same PT of the Tonemaster ( looks like bias voltage doubler in both amps model).

Fender Pro tube has 8 pre tubes and Tonemaster only 3 , wow...same PT!?!
by grtamp
Sun Aug 24, 2014 12:22 pm
Forum: Dumble Discussion
Topic: PT for SSS
Replies: 15
Views: 2416

Re: PT for SSS

I think 28V brown-brown is for bias voltage doubler circuit!
by grtamp
Fri Aug 22, 2014 2:13 pm
Forum: Dumble Discussion
Topic: PT for SSS
Replies: 15
Views: 2416

Re: PT for SSS

...but I would build a #002 SSS
by grtamp
Fri Aug 22, 2014 12:13 pm
Forum: Dumble Discussion
Topic: PT for SSS
Replies: 15
Views: 2416

Re: PT for SSS

100W !!!
by grtamp
Fri Aug 22, 2014 8:20 am
Forum: Dumble Discussion
Topic: PT for SSS
Replies: 15
Views: 2416

Re: PT for SSS

I think I will run with twin reverb iron.

Thanks Smitty
by grtamp
Thu Aug 21, 2014 1:32 pm
Forum: Dumble Discussion
Topic: PT for SSS
Replies: 15
Views: 2416

PT for SSS

Does the Tonemaster PT handle current enought for SSS circuit? I found one with these characteristic: Thanks Primary: Thermal Fuse: white/white 0V RED 120V GREEN 0V YELLOW 100V VIOLET 110V BLUE 120V BLACK Secondary: 185V@600mA RED 0V GREEN/YELLOW 185V RED 28V@300mA BROWN 0V BROWN 6,3V@8A GREEN 0V GR...
by grtamp
Mon Aug 18, 2014 1:01 pm
Forum: Technical Discussion
Topic: Ampeg SVT3 pro PT problem
Replies: 3
Views: 760

Re: Ampeg SVT3 pro PT problem

Hi Martin , I haven't a neon bulb to do that test ! I have tested the trafo out the amp with a fuse connected to the prim (sec. open). the fuse blows again! Also I tested the 2 primaries: between black-white 38.11uH 0.544Ohm between brown violet 19,92uH 0.205Ohm I tested also between black and viole...
by grtamp
Sun Aug 17, 2014 7:36 pm
Forum: Technical Discussion
Topic: Ampeg SVT3 pro PT problem
Replies: 3
Views: 760

Ampeg SVT3 pro PT problem

Hello everyone,

a friend of mine brought me a Ampeg SVT 3 PRO, telling me when He turn on , the fuse blows.
In fact, the fuse blows even with the secondaries disconnected. could be the transformer fault?

Thanks
by grtamp
Sun Aug 17, 2014 6:21 pm
Forum: Fender Discussion
Topic: vibrato circuit
Replies: 18
Views: 3798

Re: vibrato circuit

Thanks all!!
by grtamp
Sat Aug 16, 2014 3:02 pm
Forum: Fender Discussion
Topic: vibrato circuit
Replies: 18
Views: 3798

Re: vibrato circuit

thanks all for the input , I think to go with this:
by grtamp
Fri Aug 15, 2014 8:27 pm
Forum: Fender Discussion
Topic: vibrato circuit
Replies: 18
Views: 3798

Re: vibrato circuit

Hi , I have one socket only in my chassis , I can use a double triode only!

6G16 vibroverb?
by grtamp
Fri Aug 15, 2014 12:53 pm
Forum: Fender Discussion
Topic: vibrato circuit
Replies: 18
Views: 3798

vibrato circuit

Hi , I want buid an amp with Vibrato circuit but I don't know what to use: opto or bias modulating type?.

What you suggest me?

There is a great differences between them?

Thanks

R.
by grtamp
Wed Jun 25, 2014 2:58 pm
Forum: Dumble Discussion
Topic: 100hz noise problem
Replies: 6
Views: 1376

Re: 100hz noise problem

both Vol & MV are grounding to the Bus bar!
by grtamp
Wed Jun 25, 2014 7:47 am
Forum: Dumble Discussion
Topic: 100hz noise problem
Replies: 6
Views: 1376

Re: 100hz noise problem

no , I changed the 500Pf cap with another one , but it's the same!

I changed the ground point from PS board also , but nothing!