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In Reply to: CCS Transconductance Amp, schematic, Measurements posted by John Swenson on May 26, 2005 at 01:21:20:
Hi John:you might want to do a serch on the MQ forum for the SJPC 60... from memory this Special Japanese Plate Choke was designed to produce >100 henries of L while carrying sixty mils of dc plate current.
it's not in production right now... we build them for an overseas customer... but check it out and see if it might meet your needs.
If your current requirements were 40 mils... then the Dowdy plate choke (125H at 40 madc) might be the ticket.
gotta go,
Follow Ups:
The SJPC-60 was rated at 125H @ 60mAThe SJPC-40 was rated at 175H @ 40mA
They were available for a limited time last summer.
Hi Mike,
the next version uses an EL519 which runs high voltage and high current (but not both at the same time, you still have to stay within the plate dissipation), so could go with a lower primary impedance, which means lower inductance needed, but higher current.I could use a TFA-2004 and a BAC 80 (BTW what's the price on the BAC 80, I don't see it listed anywhere).
Any pinstripe TFA-2004s?
Hi John:we can make a pair of 2004 pinstripes... and depending on the power level needed... we have some 2004 Juniors in various flavors... at good prices.
BAC 80 plate chokes are $150 each.
contact me at acrosound at aol dot com for more information or call me at 215-288-4816 in the evenings.
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