Hi Doc.
I thought those numbers rang some bells. They are Motorola numbers.
And from my trusty Motorola Semiconductor Data Book (1970) here are
the specs:
MR1033B
Peak repetitive reverse voltage: 300 V
Non-repetitive reverse voltage: 400 V
RMS Reverse voltage: 210 V
Average repetitive
Likewise I'm using a HA5 with fine results
John K5MO
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Thanks, Garey, for reply.. I've got an old Galaxy 2000 power supply torn apart
and wanted to replace both caps and diodes but couldn't find any
cross-references on those rectifiers.
I had some diodes used in the L4B but it looks like they won't handle the
Galaxy load.. I don't know if you're
Years ago, many years ago actually, I bought a VF-1 at a hamfest in Springfield
Ohio for a buck. I used it with a home brew 1625 CW transmitter for my very
first ever 160 meter contact around 1977. Only compalint I had was a phone call
from a local ham for having bad key clicks!
Gary___
Gary,
I'm not familiar with the VF-1 but I have an Eico model 722 VFO in which
I've replaced the electrolytic capacitors. It has its own AC supply. I
haven't tried to use it on the air yet so I can't say anything about how
much it drifts. It should be possible to correct drifting by using
capacito
Floyd -
Now that's a mean thing to say! :-)
I used a VF-1 for several years handling traffic on CW, (very picky ops
re signal quality, especially high speed,) with no problems. See
January 2008 ER.
There ARE several identified ways for the VF-1 to go astray however,
aside from the obvious
Doc -
Both those diodes cross to an NTE156, which is a 1000 PIV @ 2A rectifier.
IF your device actually NEEDS 2A, then a 1N5408 (3A) would be an
inexpensive replacement.
If you actually need less than 1A, a 1N4007 is even cheaper and easier
to find.
What are they used in? Drake?
For futu
This'll take you back a piece.. I've been looking, without success, for a cross
reference on a couple of vintage diodes from an old power supply.. would
appreciate a reply from anyone who might give me a cross reference or ratings
specs on:
MR1033B & MR1034B
Thanks a bunch
Doc
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Why there are any VF-1s left on the planet is a mystery to me. I owned a
couple of them, beginning in 1959, and they were absolutely dreadful.
Guaranteed to drift and chirp. You could always tell who was using a VF-1
when you heard the CW signal. The Eico 722 was a good stable VFO and I
stil
Hi to all the Drake Fans:
Can anyone recommend replacement high performance mixers for the late model
Drake R4-C, serial number 27k+?
Characteristics of Mixers desired:
(1) Double Balanced Mixer or
(2) Two doubly balanced mixers phased together
(3) Hard Swithching Mixer
(4) Voltage method of m
Gary - there are a couple of alternatives to consider. There was an addendum
to the 2-NT manual that identified the Heathkit HG-10B and the Hallicrafters
HA-5 as being suitable VFOs.
I was lucky and found a nice Hallicrafters HA-5 VFO on eBay. I had a HG-10B
but the problems with that VFO (an
I'm looking for a VFO for my "new to me" 2-NT. I've read where several
older VFOs will work with some modifications, mainly converting to grid
block keying. Has anyone had experience with the old Heathkit VF-1? I
believe it has to be modified for grid block keying but I'm not exactly
sure h
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