|[AMRadio] Ranger Audio... the numbers|
jack at schmidling.com
Thu Nov 16 23:02:11 EST 2006
I can not do a freq response test because I do not have a proper sig
gen. Mine is a cheap step job and the amplitude is all over the place.
I put a 1khz sine wave into an earphone sitting on the mic and measured
p-p values with a scope....
Pin 2 V7A (grid)........ 5mv
Pin 7 V7b (plate)........50 mv
Pin 2 V8 grid............. 3 v
Pin 1 V8 plate.......... 40 v
Pin 5 V9/10 grid........ 20 v
Pin 3 V9/10 plate....... 10 v (standby)
Pin 3 """"""""""....... 50 v
I assume that where the voltages dropped it had something to do with the
transformer being across the output and the standby more for the mods.
I all cases, the amplitude dropped a bit and the sine wave got a little
"bent" when going from stdby to phone. It flattened out slightly.
In the case of the grids of the mods.. a great deal of distortion was
seen when in the phone mode. Only an approximation of a sine wave with
jagged festoons all over. None of this was seen when looking at the
plates in the phone mode.
So, what can we make of this?
PHOTO OF THE WEEK: http://schmidling.com/pow.htm
Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver http://schmidling.com
More information about the AMRadio mailing list
This page last updated 17 Dec 2017.