I'd be glad to help. Do you have a TL922 schematic? Get out and lets take a look. Do you want to call me on the phone? Thanks 73 Jim W7RY On 1/24/2019 5:41 AM, Dave G. ve9cb@rac.ca wrote: Hello all:
First... Do a picture search on your favorite search engine for both the AL80A and AL80B. The differences will be pretty stark. Then we can talk. Thanks 73 Jim W7RY Thanks Paul K0UYA _______________
Good point on the LED. It is in SERIES with the PTT circuit and the LED has a voltage dropping resistor across it. 73 Thanks 73 Jim W7RY On 2/6/2019 8:14 AM, gudguyham-- via Amps wrote: Jim, no, its
Paul, WD7S is a silent key. I don't think he left his stock to anyone. I wish I had known, I would have been winning to take it on. Thanks 73 Jim W7RY On 2/13/2019 6:27 PM, mike via Amps wrote: W7 so
/* snip */ and I would make it so an increasing reflected power value would cause the ALC to back off the drive, I think every H. P. amplifier should do that. Why? For what reason? Just re-tune.
Make sure you use at least a 6' RG58 (or similar 66% velocity factor) jumper between the amplifier and the radio. Report back as to your findings then. Thanks 73 Jim W7RY I believe I have an issue wi
I just rebuilt a Ten-Tec Titan 435 that had horrible drift issues on 160 meters. The RF current in the load cap on 160 is very high! I used strings of 100 pF 3KV CERAMIC disk caps. *No more drift.* M
Here is the link for the Titan 425 loading padder replacement: http://s900.photobucket.com/user/w7ry/library/Ten%20Tec%20Titan%20425%20Replacement%20Padders Thanks 73 Jim W7RY I used strings of 100 p
If you think that adding a second tube double the plate load impedance.... then you don't understand how linear amplifiers work. Now if you double the plate current, (1.8 amps, which a stock AL1500 w
Speaking of re-reading.... Thanks 73 Jim W7RY Getting back to the 2 holer AL-1500, it will handle ~ 3dB over 1500W and survive if only done for short periods such as in a pileup and a bit of extra ai
I would imagine that a 500 or 750 pF doorknob that could handle the current on 160 meters is at least $150.00 or more. That is why modern amplifier manufactures don't use them. They use what I used,
Put your money where your mouth is Jim.. Please send a link that includes prices that I can order. Thanks 73 Jim W7RY I would imagine that a 500 or 750 pF doorknob that could handle the current on 16
Also... 3cx800 is only 13.5 volts at 1.5 amps each for the filament (1 tube). Pretty small transformer. Thanks 73 Jim W7RY Mike, W1NR I decided I had more amps than I needed even running SO2R with ba
You have not mentioned the most important part... Re-wiring the 120 volt cut off bias. If a tube shorts, it takes out the filament transformer. Study the schematic. Thanks 73 Jim W7RY On 4/29/2019 7
/*_Tomorrow I will detail the rest of the TL-922A makeover, new tube sockets, new band switch, new tubes and a W8JI grid grounding party_* /Which means to me, that you are going to do other work? So
This diagram shown below is *WRONG. DONT USE IT!* Its the exact same as a TL922. I'll get the proper circuit drawn and send it out. Thanks 73 Jim W7RY /*_Tomorrow I will detail the rest of the TL-922
Here is the modification (simple schematic) to the cut-off bias in the Kenwood TL-922 amplifier. -- Thanks 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contestin
Here is the corrected schematic. Thanks 73 Jim W7RY I'll get the proper circuit drawn and send it out. Thanks 73 Jim W7RY On 5/8/2019 7:54 PM, Jim wrote: Because you say you want to ground the grids
I tried to post a schematic and the moderator wont allow it for some unknown reason. Schematic is attached. Thanks 73 Jim W7RY Lou WA5LOU Here is the modification (simple schematic) to the cut-off bi
There is a LOT of BLOCKING going on on this list. Bout time to move to groups.io Thanks 73 Jim W7RY Joe WB9SBD _______________________________________________ Amps mailing list Amps@contesting.com ht