[HBR] Fw: Building a HB-65.... (sort of)

[Hugo W. Catta]

....snip...

> Having looked again and counted more accurately, I don't think you'll
> have a problem if you replace the 6BA6's with 6EH7's.

When I was a teenager, I built my first Receiver with a semi-kit of
"Torotor" coils :

1 "block of coils" (3 per band) mounted with a switch.
1 1900Khz I.F. transformer
2 110Khz seconf IF tranformers
1 110Khz BFO coil
1 2010Khz crystal
1 S-meter (1mA)
1 high quality 3-gang variable cap.
1 brass cap for the BFO
1 Circuit diagram

TRIVIA QUESTION for the Old Timers:
What origin the Torotor coils were ?
I'll think of a prize for the first correct answer...
Clue: Is not China, nor the U.S.A..


All european tubes, and the IF amps were EF183 and EF89 (?)
I worked Ok on 40 and 80. The only thing nobody told me and in those days my
knowledge was poorer than today, was that a STEEL chassis is a NO-NO !!!.



they were
> never much used by designers.   A 9-pin socket is required and the
> plate current will be a few mA higher.

....snip...

Don't have the room for 9pins; don't have the extra mAmps either.


>
...snip

>
> The one remaining issue is the 1st oscillator.   I'm pretty near certain
> that you won't be satisfied with the SSB performance unless you
> provide a buffer.   An unbuffered 5200-5800 kcs oscillator just isn't
> going to be stable enough to avoid pulling on signal peaks.   I think it
> will be okay receiving AM or CW but on SSB you'll have noticible
> distortion.   Of course SSB may not be an important design goal.

The companion project of course would be a transmitter..... 40 and 80 with a
1700Khz IF.
This way I could use a REAL VFO injection from the xmtr.

Plan "C" could be also to cheat a little and use our good friend the MOS-FET
as a buffer - amplifier stage after the triode HFO.

...snip...
>
> My HBR2K pictures have been taken down; I'll try to get them put
> back up (probably have to take new ones) within a couple of days.

Looking forward to see them

73
 Hugo
AA1XV