[Engineer]

Hi, Vacuumlanders,
I picked up several old Heathkit units this week. One is a model AG-7
RF signal generator that mostly works fine, except on the highest
frequency band (20 to 50 MHz) there's no output. Another is a
regulated power supply, model PS-3, that I'm in the process of checking
out and bringing up very slowly on a variac.
Can anyone point me to the schematics for either or both of these two
models?
BTW, I can't find them on the Heathkit Museum website.
Many thanks for all replies,
Cheers,
Roger

[Sal Brisindi]

Engineer wrote:
Hi, Vacuumlanders,
I picked up several old Heathkit units this week. One is a model AG-7
RF signal generator that mostly works fine, except on the highest
frequency band (20 to 50 MHz) there's no output. Another is a
regulated power supply, model PS-3, that I'm in the process of checking
out and bringing up very slowly on a variac.
Can anyone point me to the schematics for either or both of these two
models?
BTW, I can't find them on the Heathkit Museum website.
Many thanks for all replies,
Cheers,
Roger

Roger,
I just scanned the schematic and uploaded it to my website. You can
download it at http://www.tuberadios.com/heathkit/heathkitps3.pdf

Regards,
Sal Brisindi

[Engineer]

Sal Brisindi wrote:
Engineer wrote:
Hi, Vacuumlanders,
I picked up several old Heathkit units this week. One is a model AG-7
RF signal generator that mostly works fine, except on the highest
frequency band (20 to 50 MHz) there's no output. Another is a
regulated power supply, model PS-3, that I'm in the process of checking
out and bringing up very slowly on a variac.
Can anyone point me to the schematics for either or both of these two
models?
BTW, I can't find them on the Heathkit Museum website.
Many thanks for all replies,
Cheers,
Roger

Roger,
I just scanned the schematic and uploaded it to my website. You can
download it at http://www.tuberadios.com/heathkit/heathkitps3.pdf

Regards,
Sal Brisindi

Sal, many thanks. Since posting I've got the PS-3 up and running.
Seems to work OK. After playing around with it this afternoon there
are no surprises! It took me a while to get the two series 20 MFD
electrolytics to form equally but now they share voltage to within
about 15 volts (they need a 1/2 meg across each to be sure.) The P/S is
quite limited in range: Off-load it goes to about 500 VDC max. With a
5,000 ohm WW resistor load, the max output is 300 VDC at 60 mA (the
meter reads both correctly.) Regulation against changes in AC input is
fair: at 200 VDC into 5K (120 VAC in) it drops by 5 volts at 90 VAC in,
most of it between 95 to 90 VAC.
Your .pdf tucked away for reference, with a copy in the instrument case
for the next custodian!
Thanks again,
Cheers,
Roger

[Sal Brisindi]

Engineer wrote:

Your .pdf tucked away for reference, with a copy in the instrument case
for the next custodian!
Thanks again,
Cheers,
Roger


Your welcome Roger,
Here are the specs from the manual:

Linear from 0-10ma @ 450vdc
Linear from 0-20ma @ 400vdc
Linear from 0-40ma @ 350vdc
Linear from 0-70ma @ 300vdc
Linear from 0-100ma @ 250vdc
Linear from 0-130ma @ 200vdc

Regards,
Sal

[Engineer]

Bret Ludwig wrote:
Sal Brisindi wrote:
Engineer wrote:
Hi, Vacuumlanders,


Roger,
I just scanned the schematic and uploaded it to my website. You can
download it at http://www.tuberadios.com/heathkit/heathkitps3.pdf


Wow, the 1619. The microjimbo set had a big fetish for those for
awhile IIRC.

Er... not sure who they are... Anyway, by a coincidence I happened to
have 3 of these very odd 1619 tubes in my gander bag! For those that
do not know it, they are 2.5 volt filament type (direclty heated) with
the pin-out of a 6L6 in that big black metal metal can, but 6L6's they
are NOT!
Cheers,
Roger

[Arny Krueger]

"Bret Ludwig" wrote in message
oups.com...

Sal Brisindi wrote:
Engineer wrote:
Hi, Vacuumlanders,
I p

Roger,
I just scanned the schematic and uploaded it to my website. You can
download it at http://www.tuberadios.com/heathkit/heathkitps3.pdf


Wow, the 1619. The microjimbo set had a big fetish for those for
awhile IIRC.

Something about being useful, plentiful and cheap. They were a number of
them in mobile FM communications transmitters from WWII. BC 604 is an
example.

[Engineer]

Sal Brisindi wrote:
Engineer wrote:

Your .pdf tucked away for reference, with a copy in the instrument case
for the next custodian!
Thanks again,
Cheers,
Roger


Your welcome Roger,
Here are the specs from the manual:

Linear from 0-10ma @ 450vdc
Linear from 0-20ma @ 400vdc
Linear from 0-40ma @ 350vdc
Linear from 0-70ma @ 300vdc
Linear from 0-100ma @ 250vdc
Linear from 0-130ma @ 200vdc

Regards,
Sal

Sal, it seems about right in the 200 VDC range into 2.5K, at least. 80
mA to 0 mA (load on, load off) shows no detectable voltage change.
Cheers,
Roger