[Collins] Need advice: diode load output on R-390A

[Carl]

5W output is exceeding 6AQ5 ratings in Class A. Keep it down to around 2.5W 
max for reliability.

Carl
KM1H


----- Original Message ----- 
From: "Tom Frobase" <tfrobase at gmail.com>
To: <geraldj at weather.net>
Cc: <collins at mailman.qth.net>
Sent: Monday, October 05, 2009 8:55 PM
Subject: Re: [Collins] Need advice: diode load output on R-390A


> Dr. Gerald N. Johnson wrote:
>> On Sat, 2009-10-03 at 10:05 -0700, C E wrote:
>>
>>> All:Does this diode load output on the R-390A require a preamp? I would 
>>> like to homebrew a 6V6 single ended amplifier to obtain better audio 
>>> output.  Inquiring minds want to know. 73 de Cal, n6KYR/4
>>>
>>>
>>>
>>>
>> A 6C4 might be a better choice given the audio phool mentality these 
>> days.  There is also a mod floating around that replaces the output tube 
>> with a 6AQ5 giving a nice solid 5 watts output. ... tom, N3LLL
>> Usually a triode like a 6AT6 (half a 12AX7 would be
>> similar) to develop the 12 volts or so peak that the 6V6 needs. The
>> detector probably puts out no more than half a volt. And that's what is
>> at the diode load. The typical first audio triode has a mu of about 100.
>>
>>
>>
>
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