I just finished tearing down and rebuilding a HV/LV supply for a Globe King 500A. Galvanized the chassis and repainted all the xfmrs. Looks great, works great BUT the supply is buzzing quite loudly.
Thanks for the comments. I have a rather modest collection of 50's and 60's equipment here. I just have not run into this particular problem before. Think it is solvable. On the power supply, it is c
I am just finishing the rebuild of an AM/CW 4-250A final amp w/AM modulator and need one Cetralab Couplate to complete the job. The one I need is a PC-81 unit. Of course I will buy it if you have one
I am just finishing the rebuild of an AM/CW 4-250A final amp w/AM modulator and need one Cetralab Couplate to complete the job. The one I need is a PC-81 unit. Of course I will buy it if you have one
Dave. I have a new tuning capacitor for the LK-550/500 series (both the tube and three tube model use the same plate tuning capacitor) I purchased a long time ago and if you can use it the price is $
If you go to the Alpha website you can learn about the mods for the greater output on the 76 models or they used to do it for a price. Most of the 76's were modified for higher output power years ago
Karls advice is very close to how Alpha recommends checking individual tubes. They suggest one at a time and simply apply a small amount of drive 10-20 watts into a single tube and compare with a goo
I have two of the Plate Tuning Capacitors designed for any of the above with slightly higher voltage ratings but same capacitance which I had made by a commercial capacitor manufacturer sometime ago.
Have custom made plate tuning capacitor fits the LK400-500 series $50.00 plus shipping. Van, K7VS -- I am using the free version of SPAMfighter for private users. It has removed 771 spam emails to da
Plate voltage fine, key xmt relay and have about 50 ma. resting current. Apply 10 watts drive and the 3-500Z (which looks new!) the plate begins turning cherry red. Didn't have another 3-500Z emiac (
I have one that exhibits the same characteristics. -- I am using the free version of SPAMfighter for private users. It has removed 1392 spam emails to date. Paying users do not have this message in t
I looked for the kit on ebay. Assume that was where it was offered but didn't find it! I have one for sale. If a collector is interested. Van, K7VS -- I am using the free version of SPAMfighter. We a
I HAVE A LARGE 2 FOOT BY 3.5 FOOT POSTER FEATURING PABST "BLUE RIBBON" BEER (WHO REMEMBERS THAT LOGO???) THAT PICTURES A GUY SMOKING HIS PIPE TUNING A NC173 OR 183 WITH WHAT MIGHT PROPRORT TO BE A GL
Can anyone tell me why the SB-1000 does not follow the 80 meter band tuning range? Only band it is significantly off on. When resonance achieved on the 80/75 meter band the tuning knob is way off to
capacitor is properly aligned. All tank parts seem to be just fine. Tune up is into a 50 ohm non-reactive dummy load. On the other bands from 160 thru 10 meters the tuning dial seems to be in the bal
Thanks for all the comments. Amazing how many thoughts I received. Final results seem to suggest they simply tune up on 80 meters way off the 80 meter tune position. And not to worry. My gut feeling
I know ohms law so don't need the math. Just a very specific question regarding fuses used in an amplifier on the AC side. My amp requires 15 amp fuses if using 125V and requires 10 amp fuses for 220
That's what I kinda thought but never confirmed with some accurate information. 73 Van -- I am using the free version of SPAMfighter. We are a community of 6 million users fighting spam. SPAMfighter
I have completely restored a Globe King 500A (go to QRZ.COM and click on pix in upper right hand corner to see it). I need one knob with plastic pointer and two of the larger knobs to complete the pr
My Goodness! I just picked up a new old stock Peter Dahl XFMR. Based on what I know, it probably was built around 2002-or 3. It is tapped to supply 3KV, 4KV, 5KV and 6KV at .9 amps. The input side gi