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by skyboltone
Sun May 21, 2006 5:24 pm
Forum: Technical Discussion
Topic: Cap value, how acurate are they?
Replies: 4
Views: 2268

Why guess?

I got one of these. If you don't, you should! I mean really should!

http://www.aade.com/lcmeter.htm
by skyboltone
Sun May 21, 2006 5:18 pm
Forum: Technical Discussion
Topic: 6,3V, center tap, 100 ohm to ground, or nothing?
Replies: 3
Views: 2520

Wait a minute

Some schemes show the cathodes of the output tubes hard grounded, while cathode biased pre-amp and output tubes operate with their voltages somewhat above ground. Could this be why it is possible that the filaments in output tubes in grounded cathode schemes can operate without reference to ground a...
by skyboltone
Wed May 17, 2006 3:50 pm
Forum: Technical Discussion
Topic: Wiring up a nice, new power transformer....
Replies: 16
Views: 6337

Re: Wiring up a nice, new power transformer....

Any other words of wisdom for a 1st timer? :) Yes, during construction there are times when you will want to have your amp energizd while you work on it; checking voltages, using a scope to look at the signal, etc. When ever looking into a live circuit it is REALLY important, actually essential, th...
by skyboltone
Wed May 17, 2006 12:02 am
Forum: Technical Discussion
Topic: Wiring up a nice, new power transformer....
Replies: 16
Views: 6337

Re: Wiring up a nice, new power transformer....

Remember though:
The white wire in your house is the "neutral" and the black or red is the hot>
by skyboltone
Tue May 16, 2006 9:21 pm
Forum: Technical Discussion
Topic: Wiring up a nice, new power transformer....
Replies: 16
Views: 6337

Re: Wiring up a nice, new power transformer....

Hello all, I'm about to get to work installing a nice, new Mercury Magnetics Woden clone power transformer in my AC/DC30ish amp. This is the first amp I've built (bear with me.....:) ) so I'm slightly unclear on a couple of things. 1) On the primary, there are many wires, which as I understand, and...
by skyboltone
Mon May 15, 2006 8:46 pm
Forum: Technical Discussion
Topic: Standby switch wiring...what do you prefer?
Replies: 9
Views: 4961

Re: Standby switch wiring...what do you prefer?

Not as an amp builder but as transmitter and ham radio builder, I would prefer lifting the center tap of the transformer from ground where possible. The problem with this approach is that you still have high voltage across the two outside leads of the transformer. Don't mislead yourself into thinkin...
by skyboltone
Mon May 15, 2006 3:09 pm
Forum: Technical Discussion
Topic: Epiphone Junior
Replies: 6
Views: 2683

Epiphone Junior

Greetings all: I just ordered one of these little heads. http://img3.musiciansfriend.com/dbase/pics/products/tn/5/5/8/338558.jpg There are mods posted already all over the net. About 50 guys on the Les Paul forum have bought them and the raves continue. Peformance/cost ratio is outstanding. I'll let...
by skyboltone
Fri May 12, 2006 11:58 pm
Forum: Dumble Discussion
Topic: Reference for the Carlton/Ford tone?!
Replies: 19
Views: 3361

Re: Reference for the Carlton/Ford tone?!

Wow, that was quick. I'll have it ordered in a jiffy!
by skyboltone
Fri May 12, 2006 11:49 pm
Forum: Dumble Discussion
Topic: Reference for the Carlton/Ford tone?!
Replies: 19
Views: 3361

Re: Reference for the Carlton/Ford tone?!

Here's a clip of Carlton that IMHO really shows off the dynamic range of the Dumble (and Larry). http://bad-domain/MP3/BPbluesLCclip.mp3 The things that stand out for me are the very controlled harmonic feedback, rich low end growl, sweet top end, and just the right amount of bite when he digs in. ...
by skyboltone
Fri May 12, 2006 2:52 pm
Forum: Dumble Discussion
Topic: Chassis Interest?
Replies: 34
Views: 4026

Re: Chassis Interest?

I will commit to one Funk. Ho or no Ho.

Who makes a turret board?
by skyboltone
Thu May 11, 2006 10:53 pm
Forum: Technical Discussion
Topic: Can we talk about Speakers? But first a story.
Replies: 1
Views: 2099

Can we talk about Speakers? But first a story.

Years ago, in my salad days, when I was green and carefree and the calves sang to my horn.... I used to pester the hell out of H Alexander Dumble at his little shop on E Cliff dr. in Santa Cruz. I was horsing around with a little solid state practice amp (the first pignose had just come out) trying ...
by skyboltone
Thu May 11, 2006 10:07 pm
Forum: Dumble Discussion
Topic: Rock/Jazz switch
Replies: 8
Views: 1341

Re: Rock/Jazz switch

OK:
I want an acronym list for this bulletin board.

HRM?
PAB?
HAD?

That's probably only 1% of the group lingo on here. Make it sticky at the top of the list and HTMEGSIU. (Have the more exprienced guys set it up)
by skyboltone
Thu May 11, 2006 9:33 pm
Forum: Technical Discussion
Topic: Amp eats EL84s
Replies: 7
Views: 3431

Re: Amp eats EL84s

I'm just a newby here, but could it be that the cathode/bias resistors have drifted or been designed wrong?. EL84s plates can dissapate only about 12 watts. If they are pushed hard; by improper bias or by hi plate voltage either one, the results are failure. Watch them in the dark while using the am...
by skyboltone
Thu May 11, 2006 7:07 pm
Forum: Dumble Files
Topic: 1997 "Skyline: Schematic (TR Emerald Pro)
Replies: 6
Views: 6324

More detail on [S3988009]

Keep in mind that the CL2 grid bypass gets a 470pf or 500pf cap, not 390. I would try something in the 10pf range for OD bright cap and maybe a 20pf on the cleans. On the masters that is. Post od slope values can vary. Some people like 47k. TR uses a 100k. Two people posted pics of their Emmie on a...