"Boat Anchor" & Classic Equipment

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Homebrew 811 amp Power Supply Question

Posted: 21 Mar 2017 08:38 AM PDT
http://forums.qrz.com/index.php?thre...estion.559946/

I purchased a Homebrew HF amp at a local Hamfest that needed a power
supply. It was built by a ham that

was experienced in electronic construction, so I was told. After reviewing
the circuit and drawing up a schematic, most of the design looked standard
except for a few things Ive never seen before. I would like to get some
input before I power it up. The design is for 4, 811As in parallel.

1. The B+ connection to the deck is wired in series through the plate
current meter shunted with...



Homebrew 811 amp Power Supply Question

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1952 ARRL handbook article

Posted: 21 Mar 2017 06:35 AM PDT
http://forums.qrz.com/index.php?thre...rticle.559863/

I bought an old homebrew amplifier with a pair of 4-250s and its missing
the swinging link, and a meter isnt wired up, and it has some other
mysteries. Tucked inside was a note that says "1952 handbook pages 206-205"



I have a number of old handbooks..just not the one I need



If you have this handbook and would be willing to send me some copies,
please let me know.

73

jeff KD2AZI

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Need help to ID Hallicrafters HT-37 VOX relay

Posted: 20 Mar 2017 06:53 PM PDT
http://forums.qrz.com/index.php?thre...-relay.559878/

Hi All,



I have a HT-37 transmitter that a couple of the terminals fell off the VOX
relay. I would like to replace it with

the new style cube type relay. I would like to get the correct
specifications for the relay since it is actuated by

a tube switching circuit.



The relay is a Potter - Brumfield MH-3665-1. From an old post here on QRZ
someone had a technical catalog

and identified it with 22K ohm coil resistance and 200 VDC. My coil is
still good and I measure 10.6K ohm and

about 95...



Need help to ID Hallicrafters HT-37 VOX relay