Gerry, check your R4B, probably only 9 tubes, tube #V6 is not there but they list it. Tim
From: "Gerry" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>, "'Ian'" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
Subject: RE: [drakelist] R-4B question
Date: Sun, 4 Apr 2004 19:25:31 -0400
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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, April 04, 2004 3:47 PM To: Ian; [EMAIL PROTECTED] 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 [EMAIL PROTECTED] 139 Turner Circle Greenville, SC 29609 864 420-4652 www.K4ICL.com
www.UREGS.org for Equipment Condition Rating Standards ----- Original Message ----- From: Ian <mailto:[EMAIL PROTECTED]> To: [EMAIL PROTECTED] 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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