choke substition

[andrew]

Hi, I do not have the proper choke for a Rocket but I do have a Hammond 157G. Would it be a suitable replacement?
30H
595 ohm
40 dc current THANKS

[Structo]

I think that is a bit light on the current capacity.

I'm not positive it won't work ok but why take the chance.

I think you want the 158L

Rating: 15 Henries, 75 mA
Max. VDC: 400
Resistance: 411 ohms

http://www.tubesandmore.com/

[andrew]

Thanks Structo, I'll probably just use a 1k resistor and play it safe. I did some searching on Aiken's site and he said for a typical 50 watter go with a 50-60ma choke. Allow 5-10ma for the screens and 1-2 ma for the preamp tubes plus more just to be safe (26ma total). I have a 300-0-300 PT, 2-KT66, three 12ax7s, and a Dynaco 470 clone OT.
On the high end I get 26ma. The 157G has 40ma current capability. Do you think I'm too close to the danger zone? I'd like to get some use out of them I have two. Thanks again.

[Structo]

If those current calculations are correct then yes you should be ok.
You may have to adjust your dropping string to dial in the voltages but it should work.