hillbilly3302 wrote:

thanks for the replies... I have an old Heathkit Warrior Amp (4-811's) and
it has two of these 1N2637's in it it had some hum so I replaced the oil
filled cap. it still has a bit of hum so I figured maybe one of the
rectifiers might be bad.... need to fix it or Ill sell it as is for about
250.00 has 4 brand new 811's


Hi,

You can test a 1N2637 in any tube tester which has an 866A
tube setting. Since the "guts" of a 1N2637 has many
solid state diodes in series, a standard Ohmmeter test
won't work, since the test voltage isn't high enough
to turn the diodes on.

One item you might check in the Heath Warrior is the HV choke.
You should measure a couple of thousand a.c. volts across
it, with the High Voltage on. A shorted HV choke will result
in the increased carrier hum you describe, as well as poor
voltage regulation.

Check the 60K 100W bleeder resistor, also. An open bleeder
can be deadly.

73,
Ed k4pf