W1KSZ, W4BIN and W7VM,
Thanks
since was testing with Fluke – I’ve already Googled (the amp was built back in
81 that these 1N2637 are being removed from) and the Fluke 87 just wasn’t
cutting the mustard….
First cleaned up the pins and top connector, noticed film had formed.
fired up 13.8Vdc supply
13.8Vdc to Anode, and other to fluke on voltage measurements
and other Fluke test lead to pin X or Y (Pin 1 or 4 on 1N2637)
(Flip to insure no voltage reading in reverse direction – done)
they test good – voltage readings only in one direction
However
Saw in the HB Amp that I’d connected both FAT pins together
that was big clue that something wasn’t consistent between the tube
so the diodes would work in any socket
photos in link below show the pin on side of tube base
pin 1 or 4 is used, there is a difference in the four that Testing bore out
set of shorter 1N2637 on one FAT pin and the taller set of 1N2637 uses the
other FAT pin
http://pages.suddenlink.net/w5aj/pinX.jpg
http://pages.suddenlink.net/w5aj/pinY.jpg
slight difference in dV across diode string
All good, on to rebuilding this OLD HB amp
73 W5AJ
Robert
Midland, Texas
http://pages.suddenlink.net/w5aj/
From: David Gow [mailto:6146guy@gmail.com]
Sent: Saturday, April 03, 2021 10:44 PM
To: Robert W5AJ <woodr90@gmail.com>
Cc: amps <Amps@contesting.com>
Subject: Re: [Amps] 1N2637
Test between cap and pin 4 (one of the small pins). Google it, it is just a
plain diode in a metal tube housing. Nothing special, no other components of
ay kind, no resistors, no nothing. Schematic online, if you can't find it
email me. Cap is anode, no special tester needed. We used to run them in
Johnson Valiants as the FAA and military surplus thousands of them. They
were in hamfest tubs for 50 cents each in the early 70's. There are much
better diodes available today for cents. I have six of them still. and jkust
tested them with my antique Fluke 8020A and tested good and then tested them
with a current cheap Harbor Freight DMM and tested the same good.
Dave W7VM
On Sat, Apr 3, 2021 at 7:19 PM Robert W5AJ <woodr90@gmail.com
<mailto:woodr90@gmail.com> > wrote:
Have set of 1N2637 diodes.
Testing with Fluke produces open reading both ways.
Recall meter may not have enough voltage to test these
Other than firing power supply back up after 20 years - thoughts??
http://pages.suddenlink.net/w5aj/1N2637.jpg
Robert
Midland, Texas
http://pages.suddenlink.net/w5aj/
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