[Boatanchors] Muzak amp

[telegrapher at att.net]

I found this one up on a shelf in the garage.  When and where i obtained 
it is long lost in my past.

It's a really nice unit, probably almost an 8 on the scale.

It fired right up but i have some questions if anyone is familiar with 
them.  This one uses several 6SJ7's and a pair of glass 6L6 output 
tubes.  Inside it is a place for a couple of plug ins, whether they are 
matching networks or just plugs to set a particular impedance i don't 
know as the only one in there is a sealed unit.  This particular unit 
has the plugin module for "low impedance" and says to use a different 
one for high impedance.  Now my question is, first of all, what did they 
mean by "low impedance" on the input side?  The output is set for 600 
ohms which is what i want but i have no clue about the input.  I know 
that they, in my heyday anyway, interconnected with a telephone line 
carrying the music for distribution within a business or wherever it was 
to be used.

Anyone out there familiar with these?  Like to put it to use and see 
just how good those 6L6 tubes sound.

Larry
W0OGH


BTW, Happy Turkey Day to all you great people.  And remember what makes 
it possible, yep, the troops that went before you.