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amplifiers. Q of >5 at > 100MHz. IMO, it's better to keep suppressor Q under 2. ### The 8 k is rock stable... with a 1 turn strap of 1" wide chrome plated material... which is doing nothing..... toss

wrote: ever drive the amp hard enough to roast the grid ### partially agreed. IF u have a HV fuse... and it opens... the grid current will skyrocket..... hence another reason for a fast grid fuse.

bad! ### IF the tube fil shorted to the grid... u may well be correct. The CT of the fil xfmr would be tied to the chassis... via the neg terminal of the grid meter [through the grid fuse... then to

wrote: I understand that this is a pretty good tube since it doesn't require any special socket. If I didn't have so many irons in the fire, I'd snag this. But hell, I don't use my amp enough as it

This wouldnt be the core problem I guess but if a 33 ohm resistor has changed to 45 ohms it needs to be replaced, I hope you have done it already. To me it sounds like the problem is on the output

I forgot to add that I have just replaced the two blocking caps on the SB-200, and added a third doorknob cap on the 80M switch position in place of the big mica cap. I have not yet fired it up with

Check your plate blocking cap and pi - network components. Also TR RELAY contacts. Sounds like you have plenty or drive but output circuit may beon th ewrong frequency. Plate and load settings changes

Hi all - I have what used to be a working SB-200 amp. It is not working well at all now. I really want to get it on the air for the CA QSO Party next weekend. I come to you as a last resort. I used to

I see that there's one of these on that e-auction place for ~$57. I understand that this is a pretty good tube since it doesn't require any special socket. If I didn't have so many irons in the fire,

I just invited Hsu. I've been away for a couple of days and just got to it. What did Tom have to say to Hsu about the 811 amp? I don't get any mail from Tom since I put him in my junk mail filter;)

Bill Turner escribi: According to Bill Orr's 1959 handbook descritpion for TPTG oscillators: "The feedback of energy from the plate to the grid circuits is accomplished by the plate-to-grid

Is the Administrator clueless or what? R L Measures, AG6K, 805.386.3734 r@...

And in the Winter it keeps you warm. R L Measures, AG6K, 805.386.3734 r@...

chortle. Tom abhors dipmeters because they give false dips -- or so he says when they do not confirm his dicta. R L Measures, AG6K, 805.386.3734 r@...

I read posts on parasites to check for specious statements.

Jim -- A 2500-ohm feedback-path from the output back to the input of a tube with an amplification factor of 200 means nothing to you? It may be but both tubes have more than zero feedback C and more

* In normal amateur service, i dont see how i could ever drive the amp hard enough to roast the grid even if mistuned (2 3-500Zs) I dont tune with full power till im close to resonance btw (maybe a

wrote: bad! ### Say what ? What do u mean "the tube is already bad" ? My buddy has blown the grid fuse about 8 times cuz of misc other problems. The tube is still pumping out 15 kw. Ditto with the