Hmmm, that's interesting, both my R4B's, serial #9K and 12K, do NOT have the OB2, but the R4A's I have do, but these are definitely the earily R4A's, serial # both in the low 2K,lLike I said previously, the early R4A's were 13 tubes and the later ones 11 tubes. My R4B's has 9 tubes. Drake did make on going changes that were not advertized, the bottom of my R4B's are different, one having an extra circuit board. I would hope Drake made these changes on subsequent schematics but no telling I guess. I'll look into this, the Drake Book "A Family Affair" makes no real mention of this as well as I can remember. 73 Tim K8WBL
From: "Ian" <[EMAIL PROTECTED]>
To: "'Tim Kass'" <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>
Subject: RE: [drakelist] R-4B question
Date: Sun, 4 Apr 2004 18:15:11 -0400
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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