Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on February 18, 2020, 11:54:50 am

Title: Mil spec inductor ... which preferable use ?
Post by: kagliostro on February 18, 2020, 11:54:50 am

A friend has just given me this inductor

(https://i.imgur.com/NjtWF3T.jpg)

I'm not very familiar with inductors, usually we see inductance value and current rating

This inductor say also 10 V 60 CY - 820 Ohms

Questions

if I interpret correctly 10 V is the max ripple that can be tamed, correct ?

with this spec (only 25 mA DC) is better to reserve the use on G2 of the power tubes ?

820 ohms seems a bit high value, is it ?

Thanks

Franco

Title: Re: Mil spec inductor ... which preferable use ?
Post by: shooter on February 18, 2020, 12:52:17 pm

Quote

820 ohms seems a bit high value, is it ?

the pic indicates it's a 30 henry (30 HY).  That's ALOT of Henrys I believe

Title: Re: Mil spec inductor ... which preferable use ?
Post by: PRR on February 18, 2020, 04:10:30 pm

820 Ohms at 25mA is only about 20V of DC drop. No big deal on a >200V feed.

30H at 60Hz is a 10k reactance, *much* more than 820 ohms; so it is a "good choke".

Title: Re: Mil spec inductor ... which preferable use ?
Post by: kagliostro on February 19, 2020, 06:33:16 am

Thanks Shooter & PRR

Franco