[R-390] RE: 3TF7 resistor replacement

[Bruce MacLellan]

Hi all,
        Yep, I meant MOX, not MOV!    and 2 resistors in parallel for 51
ohms turned into  two 51 ohm resistors in parallel--- etc.     Funny, I
didn't have any trouble pouring the Famous Grouse  into the glass!    
Guess I just got my murds wixed last night. 

Thanks, someone may have taken my advice to heart.    Hope not.

Bruce
On Mon, 15 Nov 2004 13:18:02 -0500 "Drew Papanek"
<drewmaster813 at hotmail.com> writes:
> 
> 
> Charles B. wrote:
> 
> >Can some one give me the specifics on how to replace the
> >3tf7 Ballast tube with a 42 OHM resistor? <snip>
> 
> Bob Camp responded:
> 
> >Alternately you can solder the resistor to the tube socket pins 
> under
> >the IF module.<snipped>
> 
> That is neat and unobtrusive, but will add almost 4 watts of heat 
> under the 
> IF module.  Baked BFO, anyone?
> 
> Bruce MacLellan responded:
> 
> >I had a ballast fail on me last night.    I  replaced it with two
> >51 ohm  resistors in parallel inserted into #2 and #7 socket 
> positions,
> >Use 2 watt or better.     A bit of shrink tubing on the leads will 
> keep
> >them away from the socket shield mount.      If you don't have 
> carbon you
> >can get MOV s in 3 and 5 watt values from Mouser.<snip>
> 
> Two 51 ohm resistors in parallel is about 25 ohms;  that value is 
> too low.  
> The desired
> value is 42 ohms.  A 47 ohm resistor will work.  A sufficient power 
> rating 
> is 5 watts; a 10 watt
> unit would run cooler and be less of a tempation on which to burn 
> your 
> fingers.
> 
> Bruce wrote of "MOV's" from Mouser, I believe he meant "MOX" ( metal 
> oxide 
> power resistor).
> 
> Methinks the simplest ballasubstitution to be swapping out the PTO 
> and BFO 
> tubes with 12BA6, then  jumper out the ballasocket.  No resistor 
> required!
> 
> An Alfred E. Neuman impostor attempted to kick the beehive by 
> writing:
> 
> >I have heard from various experts that if one were to do this, when 
>  
> >somebody
> >turns a light switch on in any part of the house, the receiver will 
>  change
> >frequencies. Can you confirm or deny this?
> 
> In this rushing-about-hither-and-thither busy busy busy age many of 
> us just 
> don't have sufficient time
> and energy to kick about a good ol' dead horse and play the 
> controversies.   
> Wei-i Li has recognized that unfortunate hallmark of present-day 
> life and 
> has given us powerful freeze-dried knowledge comprising tidbits 
> coursing 
> through this forum over the years, complete with all of the 
> high-spirited 
> equine percussion for which one could ask.   Goto r-390a.net     , 
> click on 
> references, Pearls of Wisdom, Ballast Tube (then just add water).
> 
> Drew
> 
> 
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