开云体育

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

R L Measures wrote: Amen!! So true so true. Thats why I built a 8171! At one point Rich also gave me some help, now it runs like a charm! 73 Jim SM2EKM

On the "other" reflector a statement was made about TPTG oscillators and I posted a follow up question about the time of the Great Migration to this reflector so I never did get an answer. I'd like to

That's the awful reality of adding cathode RF-NFB with thoriated tungsten tubes in parallel With multi-tube indirectly-heated cathodes, adding cathode RF-NFB is a piece of cake, but with

Why read it more than once? Before I started the grate parasite debate with Tom I was warned by a Ham in Manhattan that he wins debates in the eyes of his groupies by never backing down, even on

Tony -- Have you ever blown a grid fusing R and observed what happens?

Try posting this on AMPS to see if Tom is staying awake (he censors it).

When a high-R exists in the cathode circuit, as soon as 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

the ### Will.... I'm gonna nonminate you as... "project manager". ...so you can round up all these .."stragglers".... and bring em over ...to the dark side. Jim VE7RF