[Vintage-Audio] Dynaco AF-6 questions

[Harry Vaught, KT4AE]

I just got an AF-6 from that auction place to go with the PAS-3 (I 
think) and ST-120 from the Knoxville hamfest last weekend and a pair of 
A-25's I bought new in 1970.

The AF-6 works as advertised, that is, FM good, AM dead.  Also, the "FM 
Tuned" light is out and the "Stereo" lamp is always lit.  The FM 
performance is fine, with good stereo.  I read somewhere that the Tuned 
and Stereo lamps are not just indicators, but are important to the 
circuitry.  I gather they aren't available any more and it was suggested 
to replace them with LED's and proper dropping resistance.

Are the lights important, and what is the proper dropping resistance for 
LED's?

My real hobby is tube type amateur radio equipment.  There's absolutely 
no chance of my trouble shooting something with a thousand small parts 
on half-dozen circuit boards.

Anyone know about AF-6's and its lights?

Harry Vaught
Maryville, Tennesse