Search found 114 matches

by RB
Tue Jul 11, 2017 5:47 pm
Forum: Technical Discussion
Topic: Orange/MatAmp OR120 output transformer info needed
Replies: 7
Views: 302

Re: Orange/MatAmp OR120 output transformer info needed

Sorry for the slow reply but I have been hammered working on a restoration of a Webster model 80 wire recorder. Thanks to all that have taken the time to reply. I will attempt to respond to all remarks in this post. Stevem If I owned the amp I would NOT change the current transformer or convert it t...
by RB
Sun Jul 09, 2017 6:34 pm
Forum: Technical Discussion
Topic: Orange/MatAmp OR120 output transformer info needed
Replies: 7
Views: 302

Orange/MatAmp OR120 output transformer info needed

A good friend of mine recently purchased a 1970-72 OR120. It arrived DOA and I am helping him sort it out. I cant believe what was done to the amp over it's lifespan. I have rewired/changed/ fixed every shoddy/kluged up mess and have it working. I cant believe how loud the amp is. There is one remai...
by RB
Fri May 19, 2017 6:33 pm
Forum: Dumble Discussion
Topic: Bit of current Eric Clapton/Dumble inside info
Replies: 28
Views: 2139

Re: Bit of current Eric Clapton/Dumble inside info

The tweed Super/Pro/BandMaster do not have a choke input filter. It has a capacitor input filter in a Pi configuration. The choke is a 200ma choke. I don't recall the DC resistance. If you use a standard Fender 90ma 6L6 choke between the plate and screens you will not have the power supply regulatio...
by RB
Tue Mar 14, 2017 7:11 pm
Forum: Garage Talk
Topic: Triodestore or TriodeElectronics
Replies: 33
Views: 1724

Re: Triodestore or TriodeElectronics

My experience with Amp Parts Direct has been very good. Usually get a shipping notice within 24hrs of order and the parts show up within 2 days. On three occasions I didn't receive a shipping notice or any other email for a couple of days. So I called them. A part was out of stock each time that hap...
by RB
Wed Feb 15, 2017 8:08 pm
Forum: Fender Discussion
Topic: AB763 KT88 Question
Replies: 11
Views: 697

Re: AB763 KT88 Question

Thanks Mark I had just finished reading the remarks about Triode in another area of the forum when I found your post. There was a real great guy that worked for them a few years ago. He really gave me great service but when he left they jacked me around big time on a large order and I have never bee...
by RB
Sun Feb 12, 2017 10:00 pm
Forum: Fender Discussion
Topic: AB763 KT88 Question
Replies: 11
Views: 697

AB763 KT88 Question

Thanks for all the replies. Well the speaker is an EV. Also have a couple other 101+db speakers by eminence. So looking around at possible xfmr choices I favor the a431s OT and the p782s PT Dynaco iron offered by Triode Electronics After you figure in the cost of tubes and the xfmrs and power supply...
by RB
Thu Feb 09, 2017 10:48 pm
Forum: Dumble Discussion
Topic: Bit of current Eric Clapton/Dumble inside info
Replies: 28
Views: 2139

Is it Black Face or Tweed?

Seems I recall seeing a pair of Low Power Tweed Twins behind EC for a number of years. The last versions of the tweed Super/Pro/Bandmaster/LPTwin share the same CF tone stack, PI and output section(different OTs). Preamp was different in Low Power Twin. Super/Pro/Bandmaster all the same circuit with...
by RB
Thu Feb 09, 2017 10:42 pm
Forum: Dumble Discussion
Topic: Deleted
Replies: 0
Views: 206

Deleted

Deleted
by RB
Thu Feb 09, 2017 10:13 pm
Forum: Fender Discussion
Topic: AB763 KT88 Question
Replies: 11
Views: 697

AB763 KT88 Question

I have a head that is basically a AB763 reverb only - 12AT7 PI - 2X6L6 OT is Classic Tone BFBassman 50watt 4K - PT is 200ma 320-0-320 with solid state rectifier. Heater spec is 5A so no problem with 2x12AXY 2x21AT7 and 2xKT66/6550 I am looking for the shortest path to a little more power/SPL - clean...
by RB
Mon Jan 02, 2017 7:07 pm
Forum: Dumble Discussion
Topic: High power Tweedle Dee.
Replies: 13
Views: 1027

Re: High power Tweedle Dee.

I have built/converted many Tweed Deluxes to big bottle amps. Tried all the OTs Mentioned (except MM) above and settled on the Tweed Pro/Super/Bandmaster 6k iron. 6L6,5881 and KT66 all sound amazing cathode biased. Fixed bias produces a little more power but some of the creamy quality disappears. I ...
by RB
Thu Sep 15, 2016 2:56 am
Forum: Technical Discussion
Topic: A mod/trix I never seen before
Replies: 20
Views: 2107

Re: A mod/trix I never seen before

When I pushed the submit button on my last post I thought I should have added where is martin manning when we need him?

Thanks so much for the clarification.

Randy
by RB
Wed Sep 14, 2016 10:20 pm
Forum: Technical Discussion
Topic: A mod/trix I never seen before
Replies: 20
Views: 2107

Re: A mod/trix I never seen before

When I think of feed back I understand that to be from an output to an input. This clearly bridges two outputs. I don't see how that constitutes feedback. It seems like it would create something like mixing/balancing/co-mingling of the two AC components. Would these signals be out of phase? I think ...
by RB
Wed Sep 14, 2016 3:24 am
Forum: Technical Discussion
Topic: A mod/trix I never seen before
Replies: 20
Views: 2107

trick??

I think he is referring to the silver mica between what appear to be the plate loads for the first two stages. just before the tone stack
by RB
Thu Jun 02, 2016 4:57 pm
Forum: Speakers and Cabinets
Topic: Cube 1936 = finger joint insanity
Replies: 10
Views: 1985

Wow

I think you should rename your post to "finger joint mastery".
Very kool cab.

Regards
Randy
by RB
Wed Jun 01, 2016 9:23 pm
Forum: Marshall Discussion
Topic: Buying a choke for JTM-45 build
Replies: 2
Views: 715

Buying a choke for JTM-45 build

I am going to buy a PT and OT from Mag Components but am not sure which of their chokes to buy for the JTM. I would appreciate any and all suggestions.

Regards
Randy