On 8Dec, 2019, at 8:56 PM, Roy Thistle <roy.thistle@...> wrote:

On Sun, Dec 8, 2019 at 06:21 PM, <julien.monette@...> wrote:

if you purchase any other vega450, you can have it for around 150$ on ebay.?You just have to swap the modules between those two psu and it should work fine.

Hi Julien, Hi Ken"
Ya, it might be okay to drop 150.00, for a Vega, on the chance of getting a working Infinium... if the psu is the real problem. Most of the Vega 450 modules have a voltage/current range, and are user adjustable... see the link to the Vega 450 configuration table, in one of my previous posts. You might be able to find just a module.
Yes, the Vega is a tightly speced psu… they use a thick and tough conformal coating for isolation... that makes it hard to work on the board... unless you know what the coating is.? I think the boards are manufactured in China. Don't think TDK does much board level stuff. Probably they sell the defective boards to scrappers, that sell them back to China, where they probably burn the parts off.
Best regards and wishes.
Roy

I can't help marveling at the workmanship that went into that equipment.

On 12/14/19 12:39 AM, Patrick Manning wrote:

I have also a set in the repair queue.? My 2401C sounds to be a bit
older than yours, Terry, as it's the Dymec-labeled version, s/n
622-01154.? The 2410B is 644-01052, and despite having a lower serial
number than yours, mine has an HP-labeled front panel.

I'll need to fabricate some boards to integrate them, though, as they
weren't a set and the 2401C is not equipped with the boards needed to
let it talk to the 2410B.

Gotta love a full rack width, 20+ inch deep, 13-1/2" tall nearly 100lb
stack of gear that will measure DC and AC voltage, and resistance.? One
of these years, in my spare time (so called because I have so little of
it...)? Cool old boat anchors - it's nice to know others are keeping
them alive, too.

Some photos of the 2401C are at


-Pat

On December 13, 2019 at 6:37 PM Terry Gains <terry.waihi@...>
wrote:

Who here, runs these find beasts?

My HP 2401C Integrating Digital Voltmeter (SN 811-02807 opt 21,31,146)
and HP 2410B AC - Ohms Converter Dymec (SN 644-01126) are about to be
restored, interconnected and calibrated.

They don't appear to have been mentioned this forum before, but I'm
betting someone out there is also keeping these in working order.

Incidentally, they are both in pristine condition, remarkable for
their age, and the?2410B has a asset sticker from a previous owner,
the NASA Goddard Space Flight Center, which will be left on the
instrument.

Kind regards,
Terry

I took a look at the blockdiagram of my 83592, which differs only with an

The sweeper unit is a cascade of
a) YTO o/p 2.4-7.0GHz
b) amplifier
c) isolator
d) YTM (multiplier)
e) YTF
The most probable cause imho is tracking of the 3 YIG devices, at least

The tracking is done by opamp controlled current sources and can be caused

Unfortunately I gave a few years ago my 83590 manuals away
Best regards Rien

I have also a set in the repair queue.? My 2401C sounds to be a bit older than yours, Terry, as it's the Dymec-labeled version, s/n 622-01154.? The 2410B is 644-01052, and despite having a lower serial number than yours, mine has an HP-labeled front panel.
I'll need to fabricate some boards to integrate them, though, as they weren't a set and the 2401C is not equipped with the boards needed to let it talk to the 2410B.
Gotta love a full rack width, 20+ inch deep, 13-1/2" tall nearly 100lb stack of gear that will measure DC and AC voltage, and resistance.? One of these years, in my spare time (so called because I have so little of it...)? Cool old boat anchors - it's nice to know others are keeping them alive, too.
Some photos of the 2401C are at
-Pat

On December 13, 2019 at 6:37 PM Terry Gains <terry.waihi@...> wrote:

Who here, runs these find beasts?

My HP 2401C Integrating Digital Voltmeter (SN 811-02807 opt 21,31,146) and HP 2410B AC - Ohms Converter Dymec (SN 644-01126) are about to be restored, interconnected and calibrated.

They don't appear to have been mentioned in this forum before, but I'm betting someone out there is also keeping these in working order.

Incidentally, they are both in pristine condition, remarkable for their age, and the?2410B has a asset sticker from a previous owner, the NASA Goddard Space Flight Center, which will be left on the instrument.

Kind regards,
Terry

I took a look at the blockdiagram of my 83592, which differs only with an extra low band mixer,
The sweeper unit is a cascade of
a) YTO o/p 2.4-7.0GHz
b) amplifier
c) isolator
d) YTM (multiplier)
e) YTF
The most probable cause imho is tracking of the 3 YIG devices, at least that's my experience with the older 86290B which showed the same symptoms.
The tracking is done by opamp controlled current sources and can be caused by resistor ageing
Unfortunately I gave a few years ago my 83590 manuals away
Best regards Rien

On December 13, 2019 at 6:37 PM Terry Gains <terry.waihi@...> wrote:

Who here, runs these find beasts?

My HP 2401C Integrating Digital Voltmeter (SN 811-02807 opt 21,31,146) and HP 2410B AC - Ohms Converter Dymec (SN 644-01126) are about to be restored, interconnected and calibrated.

They don't appear to have been mentioned in this forum before, but I'm betting someone out there is also keeping these in working order.

Incidentally, they are both in pristine condition, remarkable for their age, and the?2410B has a asset sticker from a previous owner, the NASA? Goddard Space Flight Center, which will be left on the instrument.?

Kind regards,
Terry