[Johnson] Need information on original Ranger

[Richard Knoppow]

    The 5V4 and   5R4 are quite different although they fit the 
same socket. The  5V4 has an indirectly heated cathode and lower 
voltage drop than directly heated rectifiers. The  5V4 is a 
medium heavy duty tube. There are a couple of military versions 
including the 5R4WGY intended for high altitude use. A 5Y3 will 
work. At one time the 5V4 was plentiful, probably not any more.
    The 1614 was, as stated below, just a selected metal 6L6, 
selected for RF performance but I don't know exactly what it was 
tested for.

On 5/21/2022 1:27 PM, Chris Farley via Johnson wrote:
> 6CL6 is a noval tube so that's impossible? Perhaps you mean 6L6? 1614 is just a selected 6L6. Mostly anything in the 6L6 family should be fine.  Rectifier should be 5R4 as indicated, 5V4 has wimpier ratings and is likely ill suited.
> Not sure what electrical differences exist between 6AX5 and 6AX5GT, consult the datasheets.
> The tube chart is correct regardless when the tx was built- this did not change.
> The resistor in question is 18K iirc. Original part was a 2 or 3W carbon comp.
> Regards,Chris
> 
> Sent from Yahoo Mail on Android
>   
>    On Sat, May 21, 2022 at 3:22 PM, donhellen at roadrunner.com<donhellen at roadrunner.com> wrote:   Chris . . .
> 
> On Sat, 21 May 2022 19:19:41 +0000 (UTC), Chris Farley <kc9ieq at yahoo.com> wrote:
> 
>> In your manual, there is a diagram showing tube locations, which are then identified in the parts list.  In the event your manual is missing pages, it may be found as the first PDF file here:https://bama.edebris.com/manuals/johnson/ranger/
> 
> I see most of the tubes match and are in the correct positions. I see
> differences with these tubes between the manual and what's actually in the
> radio:
> 
> V9 & V10 are both 6CL6 in the radio I have instead of 1614's
> V11 is a 5V4GA in this radio instead of 5R4GY (both are rectifier tubes--OK?)
> V12 is a 6AX5 instead of a 6AX5GT (probably OK?)
> 
> I won't get to look inside the VFO box until I get the radio back out but it's
> probably got what's supposed to be in there.
> 
> I'll need to know if I need to change V9, 10, and 11 to match the manual. I am
> pretty sure a tube suffix like GT doesn't normally have any importance with
> backward compatibility but let me know if it does.
> 
> I'll look at the other information and save it for future reference. I'll also
> get the weak resistor in the VFO box. Is it the 56 Ohm one or the 100K one in
> the schematic around the VFO tube?
> 
> Donald KX8K
> 
> 
> 
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL