Search found 2465 matches

by Cliff Schecht
Fri Apr 10, 2015 1:24 am
Forum: Garage Talk
Topic: Op Amp Guru's?
Replies: 17
Views: 5643

Re: Op Amp Guru's?

Dang you already ordered those crappy 5532's huh? They're decent op amps but for a few bucks you can dramatically improve the performance with a higher quality Burr-Brown part. I'd have to study the schematic a bit to find an appropriate replacement (or Google around, I'm sure others have done so) b...
by Cliff Schecht
Fri Mar 20, 2015 1:53 am
Forum: Technical Discussion
Topic: Discovered a new source for old tube equipment
Replies: 14
Views: 2927

Re: Discovered a new source for old tube equipment

How much was the Fisher? Those don't pop up so often!
by Cliff Schecht
Fri Feb 27, 2015 5:49 pm
Forum: Technical Discussion
Topic: Aluminum vs Steel chassis
Replies: 27
Views: 4804

Re: Aluminum vs Steel chassis

If you are relying on a steel chassis to carry large return currents and there is flux being leaked into that same area then yes you will be inducing hum from the power transformer. If you carefully control your high current return paths (so that resistivity in these lines is very low and voltage is...
by Cliff Schecht
Thu Feb 26, 2015 5:40 pm
Forum: Technical Discussion
Topic: Where to sell Trainwreck clones?
Replies: 16
Views: 3893

Re: Where to sell Trainwreck clones?

Thanks guys good info.
by Cliff Schecht
Wed Feb 25, 2015 7:47 am
Forum: Technical Discussion
Topic: Where to sell Trainwreck clones?
Replies: 16
Views: 3893

Where to sell Trainwreck clones?

So Ebay won't let me sell these right? Can I post them under a pseudo-name (ChooChooCrash Missile)? I read somewhere that Fender is now chasing down people who use their name/product names without permission.. Can I sell on Reverb.com without any issues?

Where do you guys sell your clones?
by Cliff Schecht
Wed Feb 18, 2015 4:58 pm
Forum: Technical Discussion
Topic: just scored some broken stuff, need help.
Replies: 20
Views: 3633

Re: just scored some broken stuff, need help.

If any of that broken stuff has any miniature circuitry in them besides what is likely blown output stages you might as well toss it out, as you'll not fix it! If they have switching type power supply's you do not even have any SS type power transformers to harvest! I disagree completely. If the OP...
by Cliff Schecht
Wed Feb 18, 2015 3:26 am
Forum: Technical Discussion
Topic: just scored some broken stuff, need help.
Replies: 20
Views: 3633

Re: just scored some broken stuff, need help.

Post pics and symptoms. I buy broken equipment and fix it often, it's actually been a decent moneymaker lately. We can probably help you work through the issues. Power amps are usually pretty easy to fix if you have the right tools.
by Cliff Schecht
Tue Feb 17, 2015 6:54 am
Forum: Garage Talk
Topic: Introduction
Replies: 5
Views: 1339

Re: Introduction

Austin here, have also lived in Lubbock and Dallas over the years that I've been on this forum. I've met a few people on this forum and they're always great company.
by Cliff Schecht
Mon Feb 09, 2015 6:25 pm
Forum: Garage Talk
Topic: For all of the roadies.
Replies: 7
Views: 1712

Re: For all of the roadies.

Never have unsticky cables ever again!
by Cliff Schecht
Sun Feb 08, 2015 4:35 pm
Forum: Technical Discussion
Topic: MOSFET Vbe multiplier ???
Replies: 7
Views: 2475

Re: MOSFET Vbe multiplier ???

I use high power FET's to do these pretty often. I have a large stash of high power TO-3 FET's laying around so they're what I use. As JM mentioned the threshold voltage is much larger than that of a BJT so you're dealing with a few volts less that you can reduce the B+ by. However this is easily ov...
by Cliff Schecht
Sun Feb 01, 2015 2:57 pm
Forum: Technical Discussion
Topic: Non-Polar Capacitors
Replies: 7
Views: 1505

Re: Non-Polar Capacitors

martin manning wrote:
rp wrote:So why aren't all e-caps non-polar? Cost?
BTW are those big value/high volatge caps like Solens non-polar?
Yes and yes.
Cost, size and for ESR reasons. The cost goes up, the size goes up and the ESR doubles. Not good for switching/linear supplies but alright for what you're doing.
by Cliff Schecht
Thu Jan 29, 2015 5:20 pm
Forum: Garage Talk
Topic: How did you get your start in amp repairs?
Replies: 24
Views: 4114

Re: How did you get your start in amp repairs?

My grandpa worked for Lockheed for many years. He was a bona fide spy during WWII and afterward, focusing, I think, on communications. Could never talk much about work. But his house, where I was babysat a lot, was FILLED with electronics. He taught me to read schematics, solder, program, shoot, an...
by Cliff Schecht
Tue Jan 20, 2015 8:44 pm
Forum: Technical Discussion
Topic: Traynor YBA-1 But Which One?
Replies: 22
Views: 4942

Re: Traynor YBA-1 But Which One?

I've had to re-engineer one or two Traynor's. They were kind of a mess when I got them although I don't remember what was from the guy I was fixing it for or from the factory (both did some naughty things that had to be removed/reworked). After a bit of cleanup and circuit tweaking though that amp w...
by Cliff Schecht
Mon Jan 05, 2015 11:34 pm
Forum: Garage Talk
Topic: 807 Beer Beam Power Tube
Replies: 20
Views: 3515

Re: 807 Beer Beam Power Tube

I like the 807 a lot. My dad is a ham so we keep a healthy supply of old American 807's and 1625's around. Not sure where the stuff about American ones sounding bad is coming from. They are literally 6L6's with a plate cap. The 6GB6 is the same deal, 6L6 structure with a plate cap. They all sound ju...
by Cliff Schecht
Sat Dec 20, 2014 1:26 am
Forum: Garage Talk
Topic: Camera/Photography
Replies: 17
Views: 2835

Re: Camera/Photography

These days you ought to be able to buy a used Nikon or Cannon simple SLR with some auto features on eBait for a reasonable price, doncha think? I mean, she isn't looking for a Leica, is she? The actual camera is the least of the worries. I am in process of looking for a Canon A-1. But I will need a...