Ian -
ALMOST all 4 Series schematics have serial number ranges on them. It consists of the date and first serial number affected in the form MmDdYYXXXXXX. As in 115688000 for 01/15/68 s/n 8000. You may ask how we know it's 01/15/68 and not 11/05/68..? Educated guess since the "early" R-4B was 926677000 for 09/26/67 s/n 8000 and the next one was 05076910501 for 05/07/69 s/n 10501.
73, Garey - K4OAH Atlanta
Ian wrote:
Interesting. I've seen 2 different schematics for an R-4B, one with V11 and one without V11 (OB2). Neither indicate serial number ranges.
Ian N8IK
-----Original Message-----
From: Tim Kass [mailto:[EMAIL PROTECTED] Sent: Sunday, April 04, 2004 5:38 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [drakelist] R-4B question
My R4B does NOT have the OB2, Drake removed that in the later R4A series, early R4A had the OB2 and 6GX6 product detector, but the 11 tube version of the R4A did away with it...73 Tim K8WBL
From: <[EMAIL PROTECTED]> To: "Ian" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]> Subject: Re: [drakelist] R-4B question Date: Sun, 4 Apr 2004 15:46:51 -0400
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 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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