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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..

--- In ham_amplifiers@..., R L Measures <r@...> wrote: ### Not quite. The GRID RING is bonded to the chassis !! This > > is not a case like Rich using 1/2 watt resistor's as "grid fuses" >

a little current begins to flow, the tube cuts off. My modified SB-220 and TL-922 do this, and if a tube ever happens to short, nothing is damaged. #### Partially agreed. When a grid fuse [inserted

wrote: weren't looking. A little wind may restart the kindling again. ######## Nice try Mike.......... it sure as heck didn't make it. Now, W8JI et all... has pissed off HSU.... somebody should tell

ORIGINAL MESSAGE: ------------ REPLY FOLLOWS ------------ Word is he's still out there with his grid dip meter looking for series resonances. :-) Bill, W6WRT

Nothing happens. ... > R L Measures, AG6K, 805.386.3734 r@...

Hey folks, I just planted the seed over there when the 'moderators' weren't looking. A little wind may restart the kindling again. Will is a good choice, he's a little more subtle than me;>)

R L Measures wrote: <snip> nope, no grid fuse if the grid is bonded to the chassis directly ;) I was referring to B- floating off ground but if it isn't, then there isn't an issue. 73, Tony W4ZT