The AM Forum

Does anyone have the data on these Kenyon transformers?

type S-23298 Output transformer (500 Ohms secondary), about 80-100W

type S-23451 filament transformer

This is the business end of the "speech amp" I'm trying to put back together. interesting schematic posted shortly.

thank you,
Patrick

If anyone has the real specs & ratios on the T-264 driver xfmr, that would be appreciated as well.
I have: "to match any driver plates or 500 Ohm line to any class B grids, 7 Watts"

I corrected this post and the schematic. Sorry for the mess. I called the guy I got the thing from, he gave me the wrong tubes. well we have all had better days.

This amp is from a church and served two purposes.

The push pull 6B6 driver is on the preamp chassis. Its plates are switched either to the T-264 input transformer on this chassis or to a T-301 output transformer on the preamp to drive indoor speakers.

The proper gain/drive setting for the chimes (church bells) was set by reading the 0-25V meter on the front panel. it measures the voltage developed by grid current through a 47 Ohm resistor.

The 210V bias, presumably for standby, is set by a pair of VR105 tubes in series with the filament transformer center tap.

838 specs:
max plate volts 1250
dissipation 100W

for 2 tubes class B push pull:
B+ 1000V
Bias 0V
peak AF g-g volts 200
zero signal plate current 106mA
max signal plate current 320mA
load resistance per tube 1725 Ohms
plate to plate load resistance 6900 Ohms
max sig drive 7 watts
max sig output 200W @ 4% THD

Curves are supposed to be like the 805.

Granted the power supply has a pair of 866's, but how that would power a quad of these carbon plate lamps I can't judge, and the iron looks like 100-200W, not 400W. Maybe the tubes run well below the ratings for increased life.

I want to spend some time on this over the weekend.