Scott,
Interesting that they even got the boxes the same as Amperex made. The
Amperex products were last coming out of Covimag factory in France,
which closed some years ago. Their industrial triodes like the 300 kW
8918/YD1342, were sold to Thales Electron Devices. We use a pair of
these in push-pull at work, at 2800 KHz, and Thales sent us a last buy
announcement a while ago, so we bought a handful of them. I didn't know
the smaller glass tube equipment and drawings were still around but
apparently someone held on to them. Thats awesome that Penta took that
on. Is the production in USA now?
I have some Eimac and Triton SK406 chimneys, if you are interested.
73
John
K5PRO
On 10/17/25 10:00 AM, amps-request@contesting.com wrote:
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Today's Topics:
1. Unveiling Of Penta Amperex 3-500zg For The First Time Ever.
The Ultimate 3-500zg Is Back !!!!!! (jim.thom jim.thom@telus.net)
----------------------------------------------------------------------
Message: 1
Date: Fri, 17 Oct 2025 07:28:23 -0700
From: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>
To: amps@contesting.com
Subject: [Amps] Unveiling Of Penta Amperex 3-500zg For The First Time
Ever. The Ultimate 3-500zg Is Back !!!!!!
Message-ID:
<CAB4ZMgt7xEs5t-04pZT_M6QUr03QGa0S3_h-XH8oK+ayWR2oQw@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Unveiling Of Penta Amperex 3-500zg For The First Time Ever. The Ultimate
3-500zg Is Back !!!!!!
Scott Mitchel, KB1SEL
( amprepairguy.com and also Harbach Electronics.com) suggested to Pentalabs
to buy out AMPEREX....so they did.
This version of a 3-500Z is built like a tank. It's 5/16" taller than a
Eimac 3-500Z...and 1/8" taller than a Chinese 3-500Z.
He measured the interelectrode capacitance and also hi- pot tested (anode
to grid, and grid to cathode) and it all comes out superb.
https://www.youtube.com/watch?v=SFOnkbEvC9s
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