Search found 216 matches

by Dr-Joned
Fri Jul 10, 2015 11:58 pm
Forum: Dumble Discussion
Topic: 3rd Generation project. Need some help with parts!
Replies: 1
Views: 688

Re: 3rd Generation project. Need some help with parts!

Have a link? Google can't find them or ebay either.
by Dr-Joned
Fri Jun 05, 2015 12:13 am
Forum: Technical Discussion
Topic: Engl 520 preamp
Replies: 10
Views: 1165

Re: Engl 520 preamp

It is an optoisolator. It is probably used for some kind of volume switching, but hard to tell without the whole schematic.
by Dr-Joned
Fri May 29, 2015 6:24 pm
Forum: Garage Talk
Topic: The internet...
Replies: 15
Views: 1449

Re: The internet...

No worries here, because I know they can't post it unless it correct. :lol:
by Dr-Joned
Fri May 22, 2015 10:50 pm
Forum: Technical Discussion
Topic: Well, now I have a GIANT chassis....
Replies: 8
Views: 1108

Re: Well, now I have a GIANT chassis....

It's odd that the website is still functioning.

http://www.genzbenz.com/
by Dr-Joned
Wed May 13, 2015 11:21 pm
Forum: Technical Discussion
Topic: BrownBox - A new toy ?
Replies: 6
Views: 812

BrownBox - A new toy ?

Has anyone tried one of these?

http://www.amprx.net/
by Dr-Joned
Thu May 07, 2015 1:28 am
Forum: Marshall Discussion
Topic: Royal MSG100 Demo Jimmy Page 73-75 Tone
Replies: 6
Views: 1113

Re: Royal MSG100 Demo Jimmy Page 73-75 Tone

Hmmmmm..... Aged chassis !
by Dr-Joned
Tue Apr 21, 2015 11:57 pm
Forum: Garage Talk
Topic: Peavey moves to China
Replies: 23
Views: 2908

Re: Peavey moves to China

by Dr-Joned
Fri Apr 10, 2015 11:59 pm
Forum: Technical Discussion
Topic: bias supply problems and thoughts
Replies: 19
Views: 1507

Re: bias supply problems and thoughts

You are going from an almost 600vct to 250vct transformer. You will need to change your dropping resistor (220k) to a lower value such as 100k or lower. This should boost up the bias output.
by Dr-Joned
Fri Apr 10, 2015 10:32 pm
Forum: Technical Discussion
Topic: Ampeg B15 preamp: Drive balanced transformer from PI?
Replies: 2
Views: 432

Re: Ampeg B15 preamp: Drive balanced transformer from PI?

If you take a look at the schematic, you have a complete balanced setup before the power tubes. The 1k resistors feeding the grids on the power tubes would be the output. This would require "padding" the preamp level down a bit. I am not sure of the actual output voltage wise, but a coupling transfo...
by Dr-Joned
Tue Mar 31, 2015 7:04 am
Forum: Speakers and Cabinets
Topic: Tolex seams
Replies: 26
Views: 4107

Re: Tolex seams

Is that Gold/White or Black/blue ?

Just kidding.

Really looks great !!
by Dr-Joned
Sun Mar 29, 2015 7:34 am
Forum: Technical Discussion
Topic: Crazy gain pot???
Replies: 5
Views: 685

Re: Crazy gain pot???

Either a bad pot or possibly it lost ground reference in one end.
by Dr-Joned
Fri Mar 27, 2015 4:37 am
Forum: Garage Talk
Topic: (deleted)
Replies: 45
Views: 4304

Re: (deleted)

What's up with deleting all of your posts?
by Dr-Joned
Fri Mar 20, 2015 11:17 am
Forum: Technical Discussion
Topic: What to build from salvaged twin reverb reissue.
Replies: 8
Views: 785

Re: What to build from salvaged twin reverb reissue.

Depending on the condition of the parts, I would buy another chassis to rehouse the twin. You could then sell it, use it, or whatever. Building a *umble styled amp is another option.

Using the parts for a standalone reverb is like powering the baby carriage with a V8. Just slightly too much IMHO.
by Dr-Joned
Sat Mar 14, 2015 1:29 am
Forum: Technical Discussion
Topic: Power transformer design question
Replies: 5
Views: 489

Re: Power transformer design question

Google "R core" transformers. They have been around a long time and are more efficient than your standard E I core tranny. I haven't done a lot of research, but they look to be easier to wind. They come in sort of a humbucking configuration.