[Dave]

I have a box of 6550s I'd like to test but the Hickok
800a doesn't list. Surely someone has come up with the
correct settings for this tube? The Hickok has settings for
the 7027 which is a pin-for-pin substitute with different
heater current requirements. But I'd prefer to test with
the correct 6550 settings. Or does anyone know the
correct alteration to 7027 settings to get a good read on
a 6550 on the Hickok 800A?

Thanks!

[Peter Wieck]

On Nov 27, 11:27 am, "Dave" wrote:
I have a box of 6550s I'd like to test but the Hickok
800a doesn't list. Surely someone has come up with the
correct settings for this tube? The Hickok has settings for
the 7027 which is a pin-for-pin substitute with different
heater current requirements. But I'd prefer to test with
the correct 6550 settings. Or does anyone know the
correct alteration to 7027 settings to get a good read on
a 6550 on the Hickok 800A?

Thanks!

Same as for a 6CA7/EL34, but bias voltage is 5V (if variable on that
unit). If you contact me directly, I will give you the settings for a
539B for both the 6CA7 & the 6550, you can derive the differences and
apply them to your 800A.

I can also test a representative sample of 6550s at the 6CA7 settings
if that helps as I do not remember if the 800A has variable bias.

Peter Wieck
Wyncote, PA

[Peter Wieck]

On Nov 27, 11:27 am, "Dave" wrote:
I have a box of 6550s I'd like to test but the Hickok
800a doesn't list. Surely someone has come up with the
correct settings for this tube? The Hickok has settings for
the 7027 which is a pin-for-pin substitute with different
heater current requirements. But I'd prefer to test with
the correct 6550 settings. Or does anyone know the
correct alteration to 7027 settings to get a good read on
a 6550 on the Hickok 800A?

Thanks!

Check your mail.

Peter Wieck
Wyncote, PA