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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

RICH SEZ... The 3cx3000A7 has 0.6 pF of feedback C. That's 6x more than the 8877 and 4x more than a 3-500Z. At its max-f rating of 110MHz, the 3cx3000A7 has an output to input feedback path with

What we are not seeing is when this fuse goes, the tube is already bad! What the grid fuse does is protect the filament transformer IMO Steven W4IIV

wrote: statements can, things will definitely be less entertaining. RICH SEZ... Why read it more than once? ### One has to be either a complete nutcase or bored.... to read thousands of postings on..