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Hi, Y'all!? Been a while since I bugged the collective so now I have a question.? It's not Hallicrafters related but there is such a wealth of knowledge around here I figure somebody might be able

Ray, On the back of my sx-100 it is stamped in rather large letter MARK-2 A. Bob w8exv

I missed the earlier threads on this subject. My SX-100 SN 132612 has black knobs. There is no indication inside or outside if it is a ""Mark" model. Is there a list somewhere that relates serial

Tom I don’t know what tests you have done on circuitry in the area . You verified the LO does not work [on any band] and no matter the new tube, so It seems something else is wrong , as Jacques

JacquesNo need to apologize, like you said, "or almost nothing" can fool a tube tester!? <grin>? My practice in tube testing, after looking at the getter, is to do a critical short test and then the

At the moment, Jim, my only other radio using a 6K8 is a home brew rcvr. The oscillator portion works just fine with this tube. Tom

Jim, I’m sorry but… All depends on the tester you use…. Nothing (or almost nothing) can fool my AVO VCM-163. For the S-20R of Tom problem. Something is open in the feedback path of the LO. Or

TomOK, do you have other receivers that use a 6K8?? Do the other 6K8s that you tried in the S-20R also work in that receiver? Tube testers will tell you when a tube is bad but not if it is good.?

Hallicafters used 3 knob designs over the years. the knobs on your unit were the last of the black knobs. they? switched to Gray in the 60's but kept making the black knobs for the older receivers

The 6K8 is NIB and tested on an I-177 for both gas and transconductance. I have also tried my other two 6K8's. Tom

I wonder if the 6K8 is a little gassy?? It seems to me that the plate potential could overwhelm the high impedance of the triode grid circuit if some gas is present.? Is a known good 6K8 available

Scott, I have a PS-150, if interested. Contact me off list if you’d like it. I’m good on QRZ. 73, Bill AI5RP ++++++++++++++++ Bill Blodgett Arlington, Texas

Tony, you say I have one that was next to the last run. How did you determine that? Bob w8exv

Scott: if you do not find an SR 500 Contact me via my qrz email . i have a recapped SR-150 with supply in excellent shape and working.? i removed it from service last Oct. when i started using my

Hi, I’m looking to buy a Hallicrafters SR-500 Tornado transceiver and PS-500 in good physical and preferably working condition. If I can’t find an SR-500, I would consider buying an SR-160/PS-150.

Jacques, yes, but why is it that positive while not oscillation? And what is preventing oscillation over all the bands and frequencies? .. it could be anything upset in the LO loop And most likely is

Richard, yours in black from previous, my adder in red Not sure I understand your question so feel free to disregard this if its nonsense. T-10, 11, 12, 13 are the plate tank of the RF amplifier

Thanks Tom for New schematic? .. did he just do it?? C38 does not seem to be connected as in Richards version.. see below please verify one way or the other. *From:* [email protected]

I posted this in another response but it fits here. Beside using a GDO as an indicating wave meter or as a grid dip oscillator it is possible to use it as a hetrodyne detector. In order to do this it

Not sure I understand your question so feel free to disregard this if its nonsense. T-10, 11, 12, 13 are the plate tank of the RF amplifier stage. The common connections go to B+ the other side go to