[Boatanchors] B&W 5100 xmtr

[Al Klase]

Sorry.  Scratch the R-44 comment.  It's actually R-49. 
Pardon my confusion.  It's getting late.

Al

Al Klase wrote:

> Hi David,
> 
> I have a newly acquired 5100 here, so this is a timely topic for me.
> 
> The PA is class C, so resting bias really isn't an issue. You want to 
> see 17 mils of grid drive and load the plate to a max of 220 mills, per 
> the manual.  I think that's all we need to know.
> 
> The modulator is another story.  Mine shows 100 mils resting, but the 
> tube data sheets I look at indicate it should be something like 32 mils. 
> (Class AB2 with 600 volts on the plates.) It's a shame B&W doesn't state 
> the tube element voltages. Have you located R44, the pot in the grid 
> circuit?  I haven't.  I'm inclined to crank the bias up and watch for 
> distortion of a test tone into a dummy load, but need to find the 
> adjustment.  Set's been working great, and haven't had it out of the 
> cabinet.
> 
> Al


-- 
Al Klase - N3FRQ
skywaves@bw.webex.net
Flemington, NJ 08822
Web Page:  http://www.webex.net/~skywaves/home.htm