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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...

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

Regardless, with just one unknown-condition example of either, you'd be foolhardy to design anything around one... Steve, K0XP

Strange. On the link you sent on one photo it shows the 6T51 as a glass tube but on another photo it shows it as an external anode. Even on evilbay they show a 6T51 as an external anode as a FU-605.

Indeed, but sadly the only other pictures I have: Looks like this? (reading backwards through the glass) is a 6T51

I agree. The pattern on the background makes it a little confusing.

Just a thought…perhaps putting the items on a white, non-patterned background, might make ID’ing them a might easier! Just sayin’! Joe – W7RKN From: [email protected]