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My first thought was that this would be easy to set up with a opto relay across the bottom resistor but on second thoughts, It might be a bit more challenging because you have the bleed down of the

WD7S, on one of his boards he sold, was made to shut things down in the event of loss of B+. If I remember?correctly, it resembled a mess of series resistors, like you would use to meter HV, (without

Let me be clear , I have to charge Ct sales tax for in state residents or In state sales. The only reason why I do not have to collect from the other states is because I do not meet the yearly gross

##? You are correct.? I was glancing at shipping costs, and was looking at next day air.....and also 2 day air.? ?That was an error on my part....from burning through it so fast. ## However I also

DXE’s price for 3-500Z tubes has FREE shipping 73 Tim K3LR Sent: Saturday, May 25, 2024 9:38 PM To: [email protected] Subject: Re: [ham-amplifiers] 3-500 tubes I see W8JI has jacked up the

I see W8JI has jacked up the price of his 3-500Z's.? ?He now list em as $300.00? EACH..... PLUS shipping. DXE's price is now $310.00 per tube.....? PLUS shipping. Harbach's price is $275.00 per

Ex was a typo

Eimac 3-500z tubes usually have zero leakage to 5k ex and beyond, grid to cathode

Careful with any hi-pot test results.? You can easily skew the results, depending on what leakage current you have it dialed up to. And ua leakage is not linear? vs applied voltage either.? Typ

Jim, This not only applies to 3-500Zs it applies pretty much to anything coming out of China. For 32 years I worked for the ‘big teal hourglass’ where we made API’s, (active pharmaceutical

If Tom is seeing 1.5 kv to 5 kv, and typ 2kv..... between grid and cathode, he just finally got a 'good' batch of tubes.? ?What about the next batch ? Any Eimac 3-500Z is 5 kv from grid to cathode,

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