RF parts is selling "re-branded" Amperex 3-500 tubes which are nothing
more than Jolita (China made) 3-500s. Just did a picture lookup on
Google and saw them. They have 5 disks vs the original Amperex 4 disk.
Eimac DID make graphite plate (stacked doghnuts) style 3-500s in the 60s
and 70s. They are pretty rare. I had several pairs in very old SB220s
that I bought at hamfests. They were clearly marked with the Eimac
label. I don't remember how many disks the Eimac tube had.
Thanks
73
Jim W7RY
On 12/9/2018 10:10 PM, Stan Gammons wrote:
Probably RF parts tubes. The RF parts 3-500ZG tubes in my L-4B have 5
disc. Seems like the Amperex ones have 4 disc. All of the Eimac
plates I've seen were vertical and corrugated shaped. Eimac made some
great 3-500Z's. Wish they still did... But, I think the tube vs solid
state amps has been covered before.
73
Stan
KM4HQE
On 12/9/18 11:59 AM, Jim wrote:
Then they are not Eimac.
Thanks
73
Jim W7RY
On 12/9/2018 10:42 AM, Paul Baldock wrote:
At 08:45 PM 12/8/2018, you wrote:
Are there serial numbers on the grid mounting disk/cone below the
plate?
No
- Paul
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