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R L Measures wrote: You can get a 1500 RPM blower from Dayton that will cool the YC-156/179 and not be loud. They've got a nice two speed blower that'll do even better if you sense the cooling air

One advantage of an 8171 is that a quiet 1700rpm blower will cool one VFB on SSB. R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Excellent chortles, Tnx, Peter R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Yes Probably 90% of 'em will tell us that heavy straps have zero L. My dipmeter says the 3-500 grid resonance frequency is c. 1MHz higher grounding with caps instead of straps.

### Yeah... at 60 hz...... 50hz if u live in EU. Later > >

protect the HV- transformer any better than a circuit breaker in the primary. cheerz ### Don't get sucked into this arguement Frank. ### Rich..... seen any 10-100 kw broadcast stations... with NO HV

vapor arc that had a v-drop of c. 20v during the period when it should have been limiting current. #### Rich, obviously a .82 ohm resistor is not gonna limit current. It's in there as a HV fuse..

Such as _________? cheers, Frank R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Hi Peter, That was medium power... inside the rated plate dissipation ;) 73, Tony Peter Voelpel wrote:

Hi Tony, Was that at 12KW output or at low or medium power? No doubt it will be that high on low power condition... 73 Peter ________________________________ From: ham_amplifiers@...

wrote: [mailto:ham_amplifiers@...] 17dbs of gain at 6KV ### With low drive.. and 6500-7300 V under load.. Plate Z is up... gain goes up. Drive em harder... gain goes down.

pentalab wrote: <snip> <snip> We've seen 17 to 19 dB gain from the 156/179 with 5500 to 6000 Volts on the plate and that's in more than one amp so it's not a fluke. 73, Tony W4ZT

wrote: ##### They are now $1995.00 socket is $395.00... both svetlana brand. The Eimac version of both will make u gag. ### agreed. YC-156/YC-179's are everywhere.. and no [failure prone} socket to

________________________________ From: ham_amplifiers@... [mailto:ham_amplifiers@...] On Behalf Of pentalab ### Who cares what Eimac sez ? ### fact is.. on a YC-156/YC-179..

Tony King - W4ZT wrote: <snip> Regarding YC-156/179 sub-mounted capacitance. I measured this today on a YC-179. Sitting on the counter top grid to anode measured 40.85 pF. Sub-mounted in a chassis it

wrote: with two tall insulated standoffs with a singls strand of RG8 shield. Smaller wire would fuse at lower currents. gfz > ## I have used the exact same deal... used one single strand from the

. He needs a 15k or 20k! is 8281/4cx15000A. ### Anecdotal?? Tell that to the 300 guys who run the above tubes just fine...sans suppressor. IMO... having the grids bolted right to the chassis IS 99.99%

a friend and I had the same problem once with a qro rig and went with two tall insulated standoffs with a singls strand of RG8 shield. Smaller wire would fuse at lower currents. gfz pentalab