Yesterday morning when I turned on my TL-922A, there was a very loud pop followed by blown fuses. I replaced the fuses, changed the setting to CW to reduce the B+ voltage and tried again. Similar res
Hi Clay, Not sure if this happens as soon as you throw the HV switch or not... but: Start with a "conquer and divide" technique. With plug unplugged and unit off, with an ohmmeter that can read diode
On Dec 4, 2004, at 12:05 PM, Clay Curtiss W7CE wrote: Yesterday morning when I turned on my TL-922A, there was a very loud pop followed by blown fuses. I replaced the fuses, changed the setting to CW
Thanks for the responses. I didn't think about an internal tube short as a possibility. I removed the plate caps from the 3-500's and the HV measures normal (2100V CW, 3100V SSB). Is it logical to as
Hi Clay, That's good - you've made some progress and eliminated 1/2 of the rig. I take it you have no good 3-500Z spares to try. If not, I wouldn't worry about blowing anything up by popping fuses. P
Clay Curtiss W7CE wrote: I don't have access to a hy-pot tester, but a simple resistance check from filament to grid on both tubes doesn't reveal a short. Filament-to-grid shorts on 3-550Zs are commo
On Dec 5, 2004, at 2:14 PM, Clay Curtiss W7CE wrote: Thanks for the responses. I didn't think about an internal tube short as a possibility. Hello, Clay -- An internal tube short makes very little so
Except, if I recall correctly, the TL-922 puts the 3-500Z filaments in series. One cannot run the amplifier with only one tube! 73, ... Joe, K4IK _______________________________________________ Amps
_________________________________________________________ You can if you leave the anode connector off of one. -- Bill W6WRT _______________________________________________ Amps mailing list Amps@con
Wouldn't that be asking for sky rocketing grid current in the tube with no B+? Mark WB8JKR On Sun, 05 Dec 2004 15:55:06 -0800 Bill Turner <dezrat1242@ispwest.com> writes: ____________________________
I think the filaments are in series in the 922, so you cannot pull one tube and test the amp that way. 73, Rob, NC0B Tom Cathey wrote: Hi Clay, That's good - you've made some progress and eliminated
Hi Rich, I didn't remove the tubes, but I did remove the anode connection to both of them for the quick HV test. The fuses don't blow when the anodes aren't connected. I figured the sound wasn't insi
I'll respond to this via reflector; I've already posted to Clay. I repaired an LK-550 (three 3-500z's) that sounded like a .22 caliber going off. It was the fuses. I removed all 3 tubes, and put them
Thanks to everyone for all of the suggestions. I put both tubes back in the sockets and hooked up the anode connector to only one tube at a time. The first tube is fine, but when I connected the seco
_________________________________________________________ I wouldn't apply any drive, just turn it on long enough to see if the fuses pop. -- Bill W6WRT ______________________________________________
QSL. Mark WB8JKR On Sun, 05 Dec 2004 20:10:28 -0800 Bill Turner <dezrat1242@ispwest.com> writes: _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
On Dec 5, 2004, at 6:03 PM, Clay Curtiss W7CE wrote: Hi Rich, I didn't remove the tubes, but I did remove the anode connection to both of them for the quick HV test. The fuses don't blow when the ano
On Dec 5, 2004, at 6:10 PM, gdaught6@stanford.edu wrote: On 5 Dec 2004 at 18:03, Clay Curtiss W7CE wrote: Hi Rich, I didn't remove the tubes, but I did remove the anode connection to both of them for
On Dec 5, 2004, at 6:32 PM, Clay Curtiss W7CE wrote: Thanks to everyone for all of the suggestions. I put both tubes back in the sockets and hooked up the anode connector to only one tube at a time.
Don't know if the TL-922A has similar problems, but my SB-220 has exhibited evidence of parasitic oscillations, and, when that happens, one gets the ".22 Caliber" pop. It is unpredictable, and, it ca