On Mar 20, 9:33*am, raypsi wrote:
On Mar 19, 8:20*am, JIMMIE wrote:





On Mar 18, 10:50*pm, RFI-EMI-GUY wrote:

JIMMIE wrote:
I have 3 mast mounted nuvistor pre amps less power supplies. I was
looking for information on these to convert them to use on the 6 and 2
meter *and 70cm ham bands. I may still have a power supply around but
as of yet I havent been able to find it. The pre amps are mount in a
somewhat egg shaped plastic container with twin lead connections on
them. Im not sure of the manufacturer. Schematics on the amplifiers
and power supplies would be nice. Directions on doing the mod would be
great. There are plans for ham band nuvistor preamps around so if I
could figure out what I have it shouldnt be that difficult to conver
it to what I want. Besides that it will give me something to do with
these old 6cw4s.

Jimmie

You would do good to find a 70's or earlier ARRL handbook. There were
many articles about Nuvistors.

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Use only Genuine Interocitor Parts" Tom Servo *;-P

I used to have access to the handbooks of the 60s and early 70s. I
thought those were some of the best years. Im always on the lookout
for some but it seems a lot of other people share my opinion and dont
want to part with them.

Jimmie

Hey OM:

Really though sounds like you have low and high band VHF wideband
preamps for maybe TV use. The low band being 54 to 88 MHz *and the
high band is 174 MHz to 230 MHz. So 6 and 2 meters is doable.

I don't know if you could squeeze UHF out of them, 6cw4s' input C is
way to high.
In tube TV's they used 6af4's for the UHF band half the input C of a
6cw4. And even that was a oscillator not a preamp.

73 OM

de n8zu- Hide quoted text -

- Show quoted text -

6cw4s may not be what is in the amps but I do have a few and a few
others. I thik the 6cw4s were something I bought for a project and the
others are left over from when I worked on TVs back in the early 70s.
They are probably the right kind. Im pretty sure I kept these preamps
because they worked because at one time I had a bushel of them most of
which had a fair amount of lightning damage.

Jimmie