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Old 5th May 2012, 03:03 PM   #1
arhi45 is offline arhi45  Romania
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Default silicon or tube rectifier in an EL34 SE

Hello all,

I need an opinion, please:
I have al the parts for an SE EL34 amp, (and specially an aluminium chassis- the chassis is my usual problem). It will be a pentode connection (some 6-8watt, on 10Watt Transcedar 3k/8ohm OTP) and a half of a 6N1P, per channel. It will take about 70+10=80mA per channel, 160mA both.

I have two possible mains transformers (toroidal):
1. 230 to 300-250-200-0-200-250-300V/ 200mA, 6.3V/6.5A, and 5V/3A, or:
2. 230 to 185-200-220-245V/0.6A (SINGLE WIRING), 6.3V/6A

I could use a tube rectifier with the first, but the consumption will be very near to the maximim limit, so I ask myself if the bass will be loud enough.

Or a silicon rectifier with a larger limit of current (0.6A delivered), but a lower anode tension (245x1.41=345V).

The amplifier will work in a shelve, open on only one side, aside an old tape recorder, which works HOT too (a Teac 2300).

WHAT do you think is the better choice, please:
Hot, high tension, (400-450V), low current (0.2A)but tube rectifier, or:
not so hot, lower tension (340-345V) higher current (0.6A) and silicon rectifier? Any opinion welcome.

Thank you.
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Old 5th May 2012, 04:42 PM   #2
DF96 is offline DF96  England
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Just because your transformer can supply 0.6A it doesn't mean the amp is forced to take it. Your voltage might be similar for either choice as a valve rectifier will drop more voltage than SS. I can't see the connection between PSU current limits and bass loudness; Class A draws the same current all the time (near enough).

As you may have a heat problem SS may be best. Add snubbers or use appropriate diodes to control any rectifier hash.
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Old 5th May 2012, 05:07 PM   #3
arhi45 is offline arhi45  Romania
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You are right, I was thinking in class B. Thanks.
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Old 5th May 2012, 07:13 PM   #4
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Use high PIV silicon carbide Schottky diodes. They are every bit as quiet as vacuum rectification. Cree's 2nd generation parts are attractively priced.
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Old 5th May 2012, 07:30 PM   #5
6L6 is offline 6L6  United States
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Eli - Could you suggest a part number as an appropriate place to start, or as something specific to look for? They sound very interesting!
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Old 5th May 2012, 08:51 PM   #6
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Quote:
Originally Posted by Eli Duttman View Post
Use high PIV silicon carbide Schottky diodes. They are every bit as quiet as vacuum rectification. Cree's 2nd generation parts are attractively priced.
How are they for cutting hardwoods?
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Old 5th May 2012, 09:11 PM   #7
M Gregg is offline M Gregg  United Kingdom
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I prefer,


On HT B+ I don't use a heat sink..YMMV..


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Old 5th May 2012, 10:35 PM   #8
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After listening to quality black plate Winged C 5u4g, I prefer SS rectification.
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Old 5th May 2012, 11:08 PM   #9
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Quote:
Originally Posted by 6L6 View Post
Eli - Could you suggest a part number as an appropriate place to start, or as something specific to look for? They sound very interesting!
For a FWCT supply, Mouser stock # 941-C4D02120A, which is a $2.88/2 A./ 1200 PIV, item, is a good choice. Use 600 PIV parts in bridge rectified PSUs. Check the catalog page out. Also, scan the archives for my posts about the "cockeyed bridge".
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Old 5th May 2012, 11:13 PM   #10
6L6 is offline 6L6  United States
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Aha! Thank you very much!

My first glance through Digi-Key, whilst searching 'Cree SIC diode' turned up one result, and it was $28.00... so your guidance is very welcome!
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