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Boards are 95% assembled and configured for 4-250A tubes. If you plan on using different tetrode tubes, you'll need to do the math outlined in the printed manual I'm including. Includes R14 wire-wound

I bought one last year from? them,10 week wait and total cost was about 1K.? ?? 73s Bob W5RG

How do you find the Peter Dahl transformer listings on Digi Key? Or any US seller? Trying to find the price to decide on a tube switch for an Alpha 76PA 3-tube amp. 73, Dave, w6de Sent: 1 March, 2024

I would toss the 1/2 wave rectifier......and replace it with a FWB.? ? Then bond the negative to the chassis.? ?A 1/2 wave rectifier is abt the stupidest thing I have ever seen.? You end up with

That’s true, once you bias the cathode instead of the grid you no longer need a negative voltage. Lou Sent from the all new AOL app for iOS

Hi Louis, Thanks for the reply.? As I said, I can't see where the polarity change would create any problem, and sounds like you've had the same experience. Appreciate the info! -- 73, ~Alan

Alan, lately that’s all I do with the FL2100 and SB200 amps. ?I do solid grounded grids on both. ?Change to cathode bias doing away with those awful grid resistors . ?I change to a low v current

Yessir!? Hammond Mfg. and DigiKey are great resources. I've ordered a couple of their Peter Dahl transformers, and they make a first-rate product! Pricing was fair enough, and they shipped quickly.

Howdy Folks, A quick question (and maybe a stupid question... but): Can anyone see any issues in reversing the polarity on the key-line circuit (from "positive ground" to "negative ground") on the

Here, some updates. This is the beginnings of the elaborate chain drive assy. 2 x more chains, yet to be installed, plus tensioner's....( for the vac tune + load caps). Note on the big model 90

What does it say on the SN on the dahl / Hammond xfmrs ??? ? Dahl / Hammond told me that it is NOT a SN, but the actual date code. I bought 2 of the dahl FWB rectifier assy's....just when dahl

Even located in the adjacent room I can still hear an arc if were to occur. The 3x6 I’m building now will have a spark gap on the c1 and c2 , grid overload , plate overload , cathode return fuse ,

Headphones yeah I almost said that , but one of the main reasons a pa comes in for repair. Person has an open on the output , way outa tune or sone sort of other issue and they don’t hear a

Yes they will convert to a hi mu Price last time I asked was roughly 2400 minus shipping to rebuild a 3cx15k . Not sure on the 3cx10k Econco changed their warranty , now 1 year / 3000 filament hours

Steve nobody puts a 3x3 or any other big tube into a desktop unit.? ?They all go into a standard 19"/ 24" rack.? Typ the blower hangs below the bottom of the chassis.? ?Putting a 100 lb box on a

WB4VVI(SK) always told me when building/designing a transmitter or amp to use a tube that was pretty flat emission wise. No sense in screwing up a good tube on a miss-wired endeavor and/or a parasitic

Because you wear headphones, and external noise doesn't bother you??

"rebuilt? by econco, and they will replace the grid with a high mu grid"?I suppose that is only possible with the 3X15 because a hi mu grid component is available? Does anyone know the cost of a

Agreed, Don't start any amp project, unless you have at LEAST TWO known good tubes. And don't build any amp with more than one tube....pita. You will have a helluva time trying to play...'match up'.

It's kinda hard to fit a 3x3 into a desktop cabinet. ... with a high 3-digit, maybe low 4-digit electric bill...