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Hi, re: your Lafayette HB-600 CB The Kokusai mechanical filter might be repairable. A common failure mode is that the foam plastic originally used within the filter case to dampen mechanical shock has

Justin – The likelihood of DC going through it is even greater if it is solid state. You just have to verify that DC still goes to where it is supposed to when you install the ceramic filter. 73 –

For what it’s worth I converted an Eico CB transceiver to 10 meters (29.6) many years ago. It was crystal transmit and VFO receive. Not sure, but if I remember correctly, it was a model 761. Mike/

This may help if your bad filter was made by Kokusai:https://kwradios.ngunn.net/IF%20FILTERS/Kokusai_Filter_Datasheet.pdfIt seems that the insertion loss is pretty much the same as the Collins

Mike - It's solid state so no tubes or HV to worry about.? I've tested low-pass filters with my Nano VNA a long time ago and seem to remember that one channel is hooked to input and the other hooked

To rough test whether the mechanical filter is working, jury rig a .01 Mfd cap disc capacitor from filter input to filter output. If volume and noise perk up, filter is probably bad. Since I worked at

Hi Justin – First, I suggest you verify that the mechanical filter is bad. Easy enough to do with a signal generator and a scope. Try to match required in and out impedances with resistors. You

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