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Solid State SS replacement of tubes, for older radios, & winding Rf chokes for that: for WWII Rx: BC-348, R-390, R-392, Hammarlund, ...

 

Of possible interest ?

Solid state replacements for tubes in some common older Ham? tube Rx :

-- A single common FET is used for each tube, in these Rx.
?? MPF102 : JFET VHF Amplifier? ( inexpensive, eBay )

-- A small Rf choke is needed for @tube replacement.
?? they can easily be wound on the Rf choke winding machine,? Reg spoke about earlier.
??? ( Or you can buy them from Charles for $1@ ; Charles provides a 1pg instruction sheet? for DIY )
????? A variety of small Choke Forms can be used,? purchased on eBay.

Contact:
Charles Smith:? did this to the BC-348, R-390a , BC-348 & R-392? and also done for a Hammarlund.
?? KV4JT
????? charlessmi1@...??
??????? ( very well written,? paper Manuals? @ $7 to $14? per radio ,? describing in detail? all the steps necessary for conversion ):

The? R-392 conversion video is the most interesting:
????? Direct Plug-in SS tube replacement modules with little modification to the radio !
???????? ( while the BC-348 & R-390 require small mods done, inside the radios )

See:




BC-348 ( three (3) different video's for the different versions ):
?

R-390a: pat1 & part2:
??
Rf chokes for most SS tube conversions:
? How to wind your own !


R-392 SS Conversion:
?
rick
 

I'd like to suggest posting this to the army-radios list. Glad to have it here, but it should be of interest to them also.

Have Fun!
Reg


On Saturday, March 30, 2024 at 10:54:25 AM CDT, gren <hrgerson@...> wrote:


Of possible interest ?

Solid state replacements for tubes in some common older Ham? tube Rx :

-- A single common FET is used for each tube, in these Rx.
?? MPF102 : JFET VHF Amplifier? ( inexpensive, eBay )

-- A small Rf choke is needed for @tube replacement.
?? they can easily be wound on the Rf choke winding machine,? Reg spoke about earlier.
??? ( Or you can buy them from Charles for $1@ ; Charles provides a 1pg instruction sheet? for DIY )
????? A variety of small Choke Forms can be used,? purchased on eBay.

Contact:
Charles Smith:? did this to the BC-348, R-390a , BC-348 & R-392? and also done for a Hammarlund.
?? KV4JT
????? charlessmi1@...??
??????? ( very well written,? paper Manuals? @ $7 to $14? per radio ,? describing in detail? all the steps necessary for conversion ):

The? R-392 conversion video is the most interesting:
????? Direct Plug-in SS tube replacement modules with little modification to the radio !
???????? ( while the BC-348 & R-390 require small mods done, inside the radios )

See:




BC-348 ( three (3) different video's for the different versions ):
?

R-390a: pat1 & part2:
??
Rf chokes for most SS tube conversions:
? How to wind your own !


R-392 SS Conversion:
?
rick
 


Additional references:

Synthesing Vacuum Tubes QEX magazine, 1997 Aug.
- Put that old tube-type receiver back to work by replacing the burnt-out tubes with JFET circuits:
By Parker R. Cope W2GOM/7


MosFets for Tubes :
QST Dec. 1969 By Albert D. Helfrick, K2BLA

SS conversion of? a? Hammerlund? SP-600:
?

Hammarlund SUPER-PRO SP-210 communications receiver of approximately 1940 design was rebuilt using modern solid-state components and associated circuitry in replacement of the original eighteen vacuum tubes:

Convert Tube Receivers to Solid State:?? (?? .... and ignore some of the lines )

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