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Old 1st March 2004, 04:40 PM   #1
rvas18 is offline rvas18  United States
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Default Choke value?

what size choke do i need for this schematic, and are there other sources for chokes than Hammond?
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Old 1st March 2004, 05:13 PM   #2
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I'd go for 10-15H.
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Old 1st March 2004, 05:37 PM   #3
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Could get by with as low as 1 or 2H, especially if you increase the second filter cap to 100uF or maybe even more.

Tim
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Old 3rd March 2004, 07:46 AM   #4
SHiFTY is offline SHiFTY  New Zealand
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Probably at least 5H or so. Hammond is ok, but try and get vintage stuff if you can.

This circuit is cool, I like the design, but you could probably try some negtive feedback. Attach a 4.7K resistor from the 8 ohm tap on each output tranny to the junction of the 2.7K and the 220 ohm resistor. If it oscillates, then swap the output transformer terminals around.

Also you could try replacing the 2 silicon diodes in the power supply with a tube rectifier, say an EZ81; or 5V4 if you have a spare 5V winding.
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Old 4th March 2004, 01:39 AM   #5
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Um... there's already a 2.7k going there for NFB
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Old 4th March 2004, 01:55 AM   #6
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Default Re: Choke value?

Quote:
Originally posted by rvas18
what size choke do i need for this schematic
There are only two sources of information on how to use chokes. One is to find an electronics engineering handbook from 50 or more years ago. The other is a free download from On Semiconductor:

http://www.onsemi.com/pub/Collateral/HB214-D.PDF

This actually has more information on chokes than any other resource I've found.

Best regards,
Charles Hansen
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Old 4th March 2004, 02:04 AM   #7
jlsem is offline jlsem  United States
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Quote:
what size choke do i need for this schematic, and are there other sources for chokes than Hammond?
2.75H is critical inductance, 5.5H would be optimum, 5H would be ok, 10H-20H would be better.

John
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Old 4th March 2004, 02:14 AM   #8
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Oops, you're thinking of a choke-input filter. This schematic has a cap in front of the choke.
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Old 4th March 2004, 03:06 AM   #9
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Hi,

The schematic shows model SA-6302 from the Company San-ei that sells tube amplifier kits http://www2.ocn.ne.jp/~san-ei/index.html the SA6302 model is quite old and not sold anymore, (the company closed down the shop in Tokyo when Tango stopped making transformers but the company has since re-opened as mail order only). All older San-ei amps used only Tango parts for chokes, power transformers and output transformers so the choke in the diagram is a Tango part. I think I have the complete circuit diagram invcluding part number in a San-ei catalogue at home so I will check later today what the spec is. Price for the complete kit including chassis was 39500 Yen.

Regards Hans

BTW, Mr Dakesue who owns San-ei was the first who imported 6C33 to Japan and he designed the first OTL amplifier with that tube, (at least in japan).
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Old 4th March 2004, 03:41 AM   #10
SHiFTY is offline SHiFTY  New Zealand
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Quote:
Um... there's already a 2.7k going there for NFB
Gah, I must not post while asleep How did I miss that!
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