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Old 26th October 2011, 12:40 AM   #1
henryp is offline henryp  United States
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Default info on dynaco st-70 ps choke

I have a new choke that is used in a dynaco st-70 and want to use it in a 300b
type amp. Does anyone know the current handling and henries of this choke?

thanks phh
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Old 26th October 2011, 01:07 AM   #2
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1.5 H, 55 ohm, and 200 mA rated.
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Old 26th October 2011, 04:58 AM   #3
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This is the Hammond equivalent.

Hammond Choke 156R
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Old 26th October 2011, 05:03 PM   #4
henryp is offline henryp  United States
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Quote:
Originally Posted by henryp View Post
I have a new choke that is used in a dynaco st-70 and want to use it in a 300b
type amp. Does anyone know the current handling and henries of this choke?

thanks phh
Thanks folks for the info. I guess I need to look for something else with more
inductance.
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Old 30th October 2011, 02:38 AM   #5
AJT is offline AJT  Philippines
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this choke is made out of 5/8inch square bobbins, using #30 magnet wire, it is easy to wind one, just fill up the bobbin, you can also layer wind if your wish, me i just scramble wind the thing....just buttend joint the E's and I's......using a thin sheet of paper between the E-I's lowers inductance a bit but gives better current handling....

if you want more inductance, you can use 3/4inch or even 7/8inch square bobbins using a #29 wire.....
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