[R-390] R-388 question?

[Renee K6FSB]

Thanks Dave-
Glad my memory is not too bad!...it did work quite well but took a lot 
of time to make it pretty so it looked original...
Renée

On 9/23/22 4:08 PM, David Olean wrote:
> That is a common conversion of the pentagrid mixer for a dual triode 
> mixer for lower internal noise. I believe it is documented in the 75A4 
> compendium that is offered by Electric Radio. I believe that it 
> originated in a Ham Radio Magazine article in the 1970s. I did the 
> same thing to my 75A4 and it worked great.
>
> Dave K1WHS
>
> On 9/23/2022 6:59 PM, John Gedde wrote:
>> Hi folks,
>>
>>
>> Long time no post.  I hope I'm not crossing a line asking a R388 
>> question, but if anyone knows the answer, it'd be this group!
>>
>>
>> I just acquired a Collins R388.  V102 has been changed from a 6BE6 to 
>> a 6DJ8.  It was a not a trivial change since the 6BE6 is a 7-pin tube 
>> and the 6DJ8 is 9-pins!!  Looking underneath, you can't tell it 
>> wasn't done by the factory (it wasn't.)  The workmanship of whomever 
>> made this mod is superb!
>>
>>
>> I have only found one reference alluding to this mod in a forum post 
>> from 1997.  The poster said he had documentation of the change so 
>> this mod must be a 'thing.'
>>
>>
>> Any ideas!
>>
>>
>> 73
>>
>> John AD2DK
>>
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