Homebrew Double conversion tube receiver Not HBR

[Jim]

I recently acquired a HOME BREW double conversion 23 channel CB
receiver, yes I now it's not a real boat anchor but given that it has
11 tubes plus several diodes , I thought I'd ask about it here. It
looks very well made. I was hoping that some one would recognize it
by tube line up. I have started drawing the schematic . It has the
following tubes, 6EH7 (the RF amp) , 12AT7, 12AU7, 6BN8, 6HR6, 6BA6,
6BE6, 6GX6, 12AX7, 6AQ5, and an OA2. It has 6 RF and IF
transformers.

The antenna is connected directly to an untuned transformer with the
RF amp feed by a cap off the secondary. The first oscillator uses a
29305 Kc crystal for the first oscillator stage. So a simple change of
crystal will put it on 10 meters AM. It has a “S meter” and what I
suspect is a meter adj. pot on the back. There is a octal socket on
the back labeled transmitter that has two lines jumped as well as a
voltage divider with a large electrolytic to ground in the middle of
the divider.

The tuning cap is three section with one section switched by a
control on the front panel. The tuning cap is driven by a very nicely
home made dial cord mechanism with a heavy flywheel. So far I have
figured out the RF and audio gain controls. The other two front
panels pots function are a question as well as the functions of four
multi section toggle switches. With the filter caps being bad. I have
not powered it up for more than two minutes.

Does anyone remember a home brew rig with these features HAM or CB? I
would like to find a schematic if possible. As I am only about half
way through drawing up one. I looked at the HBR site and it doesn't
seem to match anything there. But given the limited 23 channel
coverage (plus channels A-D) it looks like it's from the late 1960's
or real early 1970's .

Thanks For any Info.

Jim

[JIMMIE[_2_]]

On Mar 13, 10:51*pm, Jim > wrote:
> I recently acquired a HOME BREW *double conversion 23 channel CB
> receiver, yes I now it's not a real boat anchor but given that it has
> 11 tubes plus several diodes , I thought I'd ask about it here. It
> looks very well made. *I was hoping that some one would recognize it
> by tube line up. I *have started drawing the schematic . It has the
> following tubes, 6EH7 (the RF amp) , 12AT7, 12AU7, 6BN8, 6HR6, 6BA6,
> 6BE6, 6GX6, 12AX7, 6AQ5, and an OA2. *It has 6 RF and IF
> transformers.
>
> *The antenna is connected directly to an untuned transformer with the
> RF amp feed by a cap off the secondary. *The first oscillator uses a
> 29305 Kc crystal for the first oscillator stage. So a simple change of
> crystal will put it on 10 meters AM. It has a “S meter” and what I
> suspect is a meter adj. pot on the back. There is a octal socket on
> the back labeled transmitter that has two lines jumped as well as a
> voltage divider with a large electrolytic to ground in the middle of
> the divider.
>
> *The tuning cap is three section with one section switched by a
> control on the front panel. The tuning cap is driven by a very nicely
> home made dial cord mechanism with a heavy flywheel. *So far I have
> figured out *the RF and audio gain controls. The other two front
> panels pots function are a question as well as the functions of *four
> multi section toggle switches. *With the filter caps being bad. I have
> not powered it up for more than two minutes.
>
> Does anyone remember a home brew rig with these features HAM or CB? I
> would like to find a schematic if possible. As I am only about half
> way through drawing up one. I looked at the HBR site and it doesn't
> seem to match anything there. But given the limited 23 channel
> coverage (plus channels A-D) *it looks like it's from the late 1960's
> or real early 1970's .
>
> Thanks For any Info.
>
> Jim

Maybe its a copy of a Browning Eagle CB. These were popular back
then, . I remember there were some people making a Super Eagle
transmitter back then. It had a 6146 final. I think the guy making
them was from Baxley Ga.




Jimmie

[raypsi]

On Mar 14, 12:02*am, JIMMIE > wrote:
> On Mar 13, 10:51*pm, Jim > wrote:
>
>
>
> > I recently acquired a HOME BREW *double conversion 23 channel CB
> > receiver, yes I now it's not a real boat anchor but given that it has
> > 11 tubes plus several diodes , I thought I'd ask about it here. It
> > looks very well made. *I was hoping that some one would recognize it
> > by tube line up. I *have started drawing the schematic . It has the
> > following tubes, 6EH7 (the RF amp) , 12AT7, 12AU7, 6BN8, 6HR6, 6BA6,
> > 6BE6, 6GX6, 12AX7, 6AQ5, and an OA2. *It has 6 RF and IF
> > transformers.
>
> > *The antenna is connected directly to an untuned transformer with the
> > RF amp feed by a cap off the secondary. *The first oscillator uses a
> > 29305 Kc crystal for the first oscillator stage. So a simple change of
> > crystal will put it on 10 meters AM. It has a “S meter” and what I
> > suspect is a meter adj. pot on the back. There is a octal socket on
> > the back labeled transmitter that has two lines jumped as well as a
> > voltage divider with a large electrolytic to ground in the middle of
> > the divider.
>
> > *The tuning cap is three section with one section switched by a
> > control on the front panel. The tuning cap is driven by a very nicely
> > home made dial cord mechanism with a heavy flywheel. *So far I have
> > figured out *the RF and audio gain controls. The other two front
> > panels pots function are a question as well as the functions of *four
> > multi section toggle switches. *With the filter caps being bad. I have
> > not powered it up for more than two minutes.
>
> > Does anyone remember a home brew rig with these features HAM or CB? I
> > would like to find a schematic if possible. As I am only about half
> > way through drawing up one. I looked at the HBR site and it doesn't
> > seem to match anything there. But given the limited 23 channel
> > coverage (plus channels A-D) *it looks like it's from the late 1960's
> > or real early 1970's .
>
> > Thanks For any Info.
>
> > Jim
>
> Maybe its a copy of a Browning Eagle CB. These were popular back
> then, . I remember there were some people making a Super Eagle
> transmitter back then. It had a 6146 final. I think the guy making
> them was from Baxley Ga.
>
> Jimmie

Hey OM:

Multi Elmac used to be just down the street from where I worked and
they made a double conversion 9 tube receiver a model PMR-8. They sold
the S meter as an accessory.
Looks like 3 stages of IF. So 1 RF, 2 mixer, and 3 IF transformers.

73 OM
de n8zu