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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,

And since 3-500Z tubes are zero-bias .... 73 Jim N6OTQ [email protected]> wrote:

And keep in mind I make zero, zip, nada off tubes my customers purchase and drop ship to me. So my statement is truly un biased.

I have used thousands of 3-500zg penta tubes in customers pa’s. Not once have I had an issue or have any customers reported an issue. But I was putting new tubes into pa’s that I had gone through

CTR gets his 3-500Z's from the exact same chinese factory as Pentalabs....and also RF parts.? ?These are the ones with the white bases.? ?Factory #2 is junk, with a 70% failure rate....and those

The best appears to be from CTR engineering. There are two plants that make 3-500 tubes in china. These are the best of the two. They are fully Hi pot tested and guaranteed. Mine have been rock solid.

On Sat, May 18, 2024 at 06:52 PM, Joe - W7RKN wrote: > > > > It appears I have a shorted 3-500Z tube in my AL-82 amplifier. > > > > > > > > It also appears that right now the 3-500Z or ZG tubes are

Not sure why so many are freaking out about the closure and parts availability. All of the parts they carry are still in production. Most of them have other part options that will work in their place.

phone all three BOTH numbers on their contact list.? ?I got through to em....twice, 2 days ago. ameritron 1-662-323-8211 *MFJ Enterprises Inc:* Toll Free: *1-800-647-1800* *MFJ / Vectronics /

Un obtanium ? What makes you think and then say that ? Penta and all the others are Chinese. Ones with the white ceramic base all come from the same factory, and are from the better of the two