All three of those will probably be tough to find, unfortunately. Lots of different front-back dimensions were used in HP instruments of that era (and the next one).
An 8640A/B top cover would likely fit, and those are common enough... but they have no vent holes, which would be asking for trouble on the 5065A.
Same with the Bourns knobpot dial. I've never seen that particular style used elsewhere besides the 5061/5065 standards. Unless you're curating a museum, I'd think a normal 10-turn knob would work fine.
The green lenses were used on the 5061A so they may be easier to come by. Still, I'd expect to have to resort to eBay for those.
-- john
-----Original Message-----
From: Bob kb8tq via time-nuts time-nuts@lists.febo.com
Sent: Wednesday, July 1, 2026 5:41 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Cc: Bob kb8tq kb8tq@n1k.org
Subject: [time-nuts] Re: Wanted: 5065A Parts
Hi
The top and bottom covers for HP gear “of a specific generation” are all very similar. The cover for some other HP product (from the 1970’s ….) should work on the 5065.
The light bulb cover is a generic item. Like the covers, they are not quite as common today as they once were. Still they should be an eBay or ham fest sort of item. The same is true of the
10 turn counter for the pot.
Bob
All three of those will probably be tough to find, unfortunately. Lots of different front-back dimensions were used in HP instruments of that era (and the next one).
An 8640A/B top cover would likely fit, and those are common enough... but they have no vent holes, which would be asking for trouble on the 5065A.
Same with the Bourns knobpot dial. I've never seen that particular style used elsewhere besides the 5061/5065 standards. Unless you're curating a museum, I'd think a normal 10-turn knob would work fine.
The green lenses were used on the 5061A so they may be easier to come by. Still, I'd expect to have to resort to eBay for those.
-- john
-----Original Message-----
From: Bob kb8tq via time-nuts <time-nuts@lists.febo.com>
Sent: Wednesday, July 1, 2026 5:41 AM
To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com>
Cc: Bob kb8tq <kb8tq@n1k.org>
Subject: [time-nuts] Re: Wanted: 5065A Parts
Hi
The top and bottom covers for HP gear “of a specific generation” are all very similar. The cover for some other HP product (from the 1970’s ….) should work on the 5065.
The light bulb cover is a generic item. Like the covers, they are not quite as common today as they once were. Still they should be an eBay or ham fest sort of item. The same is true of the
10 turn counter for the pot.
Bob
