From: Garey Barrell 
Subject: Re: [drakelist] R-4B question


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:timkass{at}hotmail.com] 
> Sent: Sunday, April 04, 2004 5:38 PM
> To: ALink{at}K4ICL.com; ik7565{at}verizon.net; drakelist{at}www.zerobeat.net
> 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: 
>>To: "Ian" ,

>>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
>>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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