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You are forgetting the grid to cathode test specs. The China tubes usually hi pot to 1kv grid to cathode at best maybe a hair higher. Inter-electrode capacitance is roughly double of the Eimac spec.

I dont think you are in his group? He has been selling and testing these for 4 years now. Since you might not be in there, I can post the Hi pot data here: "These tubes all tested good, 24 out of 24.

##? Test any chinese 3-500Z? with a hi-pot tester.? You won't measure? 5 kv? between grid and cathode....like you see on any Eimac 3-500Z.? ? The best you will measure is 1 kv, if that....and

Who said anything about Tom and the tubes he sells not having a white base ?? I was referring to the link on here for Henry radio and the greenstone 3-500c Which has a brown base, according to the

The tube He sells clearly a white base tube. Check this link. He had them change specs on these and had to purchase hundreds of them to test before they finally got a good batch. These exceed Eimac

I have a AL80B with a factory installed QSK-5 board. (new 2019) The amp xmit fine. Receive is down. Typically it's those stupid fuse lamps Lp1, Lp2.... Open cover, remove Lp1/Lp2 -- install new ones.

The tube in the link has the brown base.? That comes from factory #2..... which per JI, has a 70% failure rate.? ( how the hell factory #2 stays in business baffles me). Factory #1 has the white

Be careful with greenstone USA.? I have read of several end users (broadcast? FM) that had one helluva time with greenstone USA when it came to warranty issues.? This was with metal triodes /

The tube in this link that was posted has a brown base https://henry-radio.myshopify.com/collections/amplifier-parts/products/new-greenstone-3-500c-glass-transmitting-tube-guaranteed It is what I was

They sell only the white base tubes. Never the brown. He actually has an article showing exact difference and performance between them. He worked with the factory in china to get the tubes to his

The tube in that link is the brown base , it is the less favorable of the two Chinese factories. Tom W8ji has explained the failure rate between one and the other. I haven’t used the brown base type

3-500's are nowhere near the "unobtanium" status.? Getting expensive now? Yes... but still quite readily available. While the original Eimac's are getting harder & harder to find (and those that are

If you buy from CTR, the tubes cost? more, plus you have to pay? for shipping. The tubes from Harbach cost less, and shipping is free...and shipped within 1 day.

3-500zg orders placed through the Harbach site will almost always ship within one business day. And if an issue comes up, penta is quick to replace. As long as within the warranty Period, and the tube

All, I emailed Tom Rauch's company to ask about prices and availability on 3-500Zs and 572Bs. ? As it happens, I have a need for both, and Rauch has a rigorous incoming test procedure, and it's

Hi Scott, I have had a hard time identifying some of the parts. Like the fuse bulbs for the QSK-5 as an example. Colin - K6JTH

You must be on the rf parts website If you call them they most likely have them. The site doesn’t get updated often. 73

Hi Joe Ameritron does not make the meters , tubes , transistors , nuts , screws , spacers , electrolytic caps, rotary switches , resistors , air variable capacitors , transformers , switches , relays

Hi Scott... All the usual sources for 3-500 tubes are showing 'none in stock', therefore, 'Unobtainium' I had never heard of ct before. I will order from them or Harbaugh. Thanks for the info on Penta

Hi Scott... Don't know where you read that, but MFJ has been adamant about informing everyone that they will continue to sell parts in stock and support any warranty repairs, but once parts are gone,