I have a RME DB-20 RF pre-amp that needs a schematic for me to check
against. This unit was made around 1938 and uses steel tubes. They were
very popular during the war because they isolated the oscillators from
putting anything back into the antenna for the enemy to zero in on.
Mine is just for short wave listening and I have no continuity on the
ground side of the antenna. If anyone can e-mail me a gif or pdf of the
schematic I would be forever grateful.
Thanks much,
Bill Baka

P.S. These had 3 tuned stages and 2 tubes worth of amplification so they
were pretty good for their time. I only get about 10-15 dB now but it
still helps.

"Bill" wrote in message
...
I have a RME DB-20 RF pre-amp that needs a schematic for me
to check against. This unit was made around 1938 and uses
steel tubes. They were very popular during the war because
they isolated the oscillators from putting anything back
into the antenna for the enemy to zero in on.
Mine is just for short wave listening and I have no
continuity on the ground side of the antenna. If anyone
can e-mail me a gif or pdf of the schematic I would be
forever grateful.
Thanks much,
Bill Baka

P.S. These had 3 tuned stages and 2 tubes worth of
amplification so they were pretty good for their time. I
only get about 10-15 dB now but it still helps.

There are schematics at BAMA http://bama.sbc.edu/
A Google search found lots of hits.




--
Richard Knoppow
Los Angeles
WB6KBL

Richard Knoppow wrote:
"Bill" wrote in message
...
I have a RME DB-20 RF pre-amp that needs a schematic for me
to check against. This unit was made around 1938 and uses
steel tubes. They were very popular during the war because
they isolated the oscillators from putting anything back
into the antenna for the enemy to zero in on.
Mine is just for short wave listening and I have no
continuity on the ground side of the antenna. If anyone
can e-mail me a gif or pdf of the schematic I would be
forever grateful.
Thanks much,
Bill Baka

P.S. These had 3 tuned stages and 2 tubes worth of
amplification so they were pretty good for their time. I
only get about 10-15 dB now but it still helps.

There are schematics at BAMA http://bama.sbc.edu/
A Google search found lots of hits.




--
Richard Knoppow
Los Angeles
WB6KBL




Thanks all too much. I just printed them and found that one set is
better than the other so I have a good, readable schematic to refer to.
Now to find the soldering iron.
Cheers,
Bill Baka, happy now.

Got into the site. Tried to access documents and log on as anymous user but
kept getting rejected.

??

"Richard Knoppow" wrote in message
m...

"Bill" wrote in message
...
I have a RME DB-20 RF pre-amp that needs a schematic for me to check
against. This unit was made around 1938 and uses steel tubes. They were
very popular during the war because they isolated the oscillators from
putting anything back into the antenna for the enemy to zero in on.
Mine is just for short wave listening and I have no continuity on the
ground side of the antenna. If anyone can e-mail me a gif or pdf of the
schematic I would be forever grateful.
Thanks much,
Bill Baka

P.S. These had 3 tuned stages and 2 tubes worth of amplification so they
were pretty good for their time. I only get about 10-15 dB now but it
still helps.

There are schematics at BAMA http://bama.sbc.edu/
A Google search found lots of hits.




--
Richard Knoppow
Los Angeles
WB6KBL

MoiInAust wrote:
Got into the site. Tried to access documents and log on as anymous user but
kept getting rejected.

Thats because all of the user connections are in use. I think it only
allows 10 at a time. That login business only appears as some browser
default in such a case. No login is required.

Try the mirror site. It is capable of handling much more traffic.

http://bama.edebris.com/manuals/



-Bill

"MoiInAust" wrote in message
...
Got into the site. Tried to access documents and log on as
anymous user but kept getting rejected.

??

"Richard Knoppow" wrote in
message
m...


Snipping here................
There are schematics at BAMA http://bama.sbc.edu/
A Google search found lots of hits.




--
Richard Knoppow
Los Angeles
WB6KBL


The problem is that the BAMA server gets overloaded.
The request for a username and password is a symptom of
this. The same material is available at a mirror site:
http://bama.edebris.com/

This also has faster downloads.



--
Richard Knoppow
Los Angeles
WB6KBL