I wonder if anyone here has modified a HP-23 to be used with Drake
gear?
The high voltage on the HP-23 runs about 800 volts and in the Drake
AC-4 at 650 volts, Im sure the other voltages differ from one to the
other as well.
Would like to know if there is a way to mod the PS.

Any input appreciated

Thanks for reading, Gil n2wjw

"gil" wrote in message
...
I wonder if anyone here has modified a HP-23 to be used with Drake
gear?
The high voltage on the HP-23 runs about 800 volts and in the Drake
AC-4 at 650 volts, Im sure the other voltages differ from one to the
other as well.
Would like to know if there is a way to mod the PS.

Any input appreciated

Thanks for reading, Gil n2wjw

You really ought to swap with someone to avoid *******ization.

There must be a schematic of the HP23 on BAMA. There are Drake T-4xB
manuals for free there too with the supplies. It looks like a plain old
voltage doubler. You could add a choke in the lead of the common leg and it
might drop it to where you need it and improve regulation. The other
voltage is 250v vs. 275v on the Heath. You might replace that choke with a
resistor. The bias would just need to be adjusted. Then you still need to
make a cable. Another way is to Mod the Drake for 6146B and get rid of the
sweep tubes and never worry about finding replacements ever again. I also
ran across a sheet on that. It would be kind of sacrilegious though. I
never liked radios with sweep tubes, but my R-4B was my favorite.

I agree with JB....The Drake supplies sure are plentiful. It would not be a
problem finding one!
....Dave

"gil" wrote in message
...
I wonder if anyone here has modified a HP-23 to be used with Drake
gear?
The high voltage on the HP-23 runs about 800 volts and in the Drake
AC-4 at 650 volts, Im sure the other voltages differ from one to the
other as well.
Would like to know if there is a way to mod the PS.

Any input appreciated

Thanks for reading, Gil n2wjw

Even if you could get the high voltage down far enough, the HP-23
doesn't have enough current capacity for the TR-4's three final tubes.

gil wrote:

I wonder if anyone here has modified a HP-23 to be used with Drake
gear?
The high voltage on the HP-23 runs about 800 volts and in the Drake
AC-4 at 650 volts, Im sure the other voltages differ from one to the
other as well.
Would like to know if there is a way to mod the PS.

Any input appreciated

Thanks for reading, Gil n2wjw

"Lonnie" wrote in message
...
Even if you could get the high voltage down far enough, the HP-23
doesn't have enough current capacity for the TR-4's three final tubes.

gil wrote:

I wonder if anyone here has modified a HP-23 to be used with Drake
gear?
The high voltage on the HP-23 runs about 800 volts and in the Drake
AC-4 at 650 volts, Im sure the other voltages differ from one to the
other as well.
Would like to know if there is a way to mod the PS.

Any input appreciated

Thanks for reading, Gil n2wjw

Good point, I forgot there were 3 of them.

Back in the day of cheap mil surplus, we would cobble up all kinds of stuff
and often add transformers and parts hanging in mid air to existing chassis
cobbled together to get what we needed. Harder to find tube junk these
days, but garage sales and one swap meet run will usually turn up enough
junk to build something.

Never let anything keep you off the air. I have fond memories of every
radio that I ever cobbled on the air. At one point I had an OLD GE Pre-Prog
250w 2m base station and 440 pre-prog and A- strip Motorolas in racks and
TCS boatanchor twins (from WW2 landing craft) on 40 and 80 meters CW.
Shelves of tube type audio gear, real to real. Rebuilt TV (no cabinet of
course) all in my bedroom as a kid. Not real efficient but lots of fun. I
wasn't paying the power bill so that issue never came up. I even modded an
SCR-522 (VHF radio from ww2 fighter planes) for 2m AM with a Variable Local
Oscillator and would slope detect local 2m FM repeaters before I could
afford a scanner. Most junk was free from dumpsters or local hams,
relatives with way too much junk in their garage. My folks were very
patient with my hobbies and at one point I had entirely taken over my room
and the 2 car garage with projects that were cheaply doable but barely time
for half of them. My Mom's dad had done the same thing, so she actually
encouraged it.