From: "Gerry"
Subject: RE: [drakelist] R-4B question
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I seem to remember there were 2 versions of the R-4B or is it the R-4A
I'm thinking about?. The R-4B (sn#9182G) I have is a 10 tube job and
doesn't have the voltage regulator tube. The only voltage regulation in
the receiver is at the PTO. Unregulated 150 volts is fed through a 6k/5w
resistor to a 1N714 zener in the PTO enclosure.
-----Original Message-----
From: owner-drakelist{at}www.zerobeat.net
[mailto:owner-drakelist{at}www.zerobeat.net] On Behalf Of ALink{at}K4ICL.com
Sent: Sunday, April 04, 2004 3:47 PM
To: Ian; drakelist{at}www.zerobeat.net
Subject: Re: [drakelist] R-4B question
Ian:
The R-4B still has the OB2 regulator. The R-4C uses a solid state
regulator, in keeping with Drake's transition from tubes to solid state
devices. You will note the significant reduction of the number of tubes
in the C series.
Removing tubes in the design reduced energy needed, cut down on heating
problems, and increased reliability.
Cheers,
Al Link, K4ICL
ALink{at}K4ICL.com
139 Turner Circle
Greenville, SC 29609
864 420-4652
www.K4ICL.com
www.UREGS.org for Equipment Condition Rating Standards
----- Original Message -----
From: Ian
To: drakelist{at}www.zerobeat.net
Sent: Sunday, April 04, 2004 11:09 AM
Subject: [drakelist] R-4B question
I'm a Drake newbie but thinking about getting an R-4B to relive my
childhood. When was V11, the OB2 voltage regulator, introduced (or
removed)? I think the R-4A has it but the R-4C doesn't. If it was
removed
as the series progressed, why?
Also why is there no V6 in the schematic?
73 de Ian
N8IK
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