[Drake] Re-cap on TR-4

[Garey Barrell]

Mel -

There is a 68 ohm, 1W resistor in series with the two dial bulbs.  It's 
probably located near the "D - B" slide switch on the back panel.  It's 
possible that this resistor is intermittent or even physically cracked.  
Putting the switch in the "B" position shorts this resistor out, 
eliminating it from the circuit.   An ohmmeter check will probably show 
that the resistor has gone up in value, at least, if not fractured.  
Your changing audio associated with the intermittent indicates a tube 
filament / wiring problem as well.

There is a downloadable manual at

<http://www.dproducts.be/drake_museum/manuals.htm>

for s/n 35161+ that might be accurate enough, although Dan, WB4GRA's 
manual for s/n 27844 is probably the "correct" one.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>



Mel Vance wrote:

>>schematic (verify it matches your serial number) and examine the
>>    
>>
>
>Anyone have a link for the manual for a TR-4 (ser# 31025)?
>
>All I got with the rig was a TR-3 manual....
>
>Mel
>N7OKL
>
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