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


Tim -

Not quite...  The two tubes dropped from the "early" R-4A 
were V6, the 6GX6 Product Detector, and V13, the AM detector 
and first audio amp.  The VR tube stayed on until the second 
version of the R-4B.

73, Garey - K4OAH
Atlanta

Tim Kass wrote:

> 
> 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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