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Old 31st July 2012, 04:42 PM   #1
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Default Best SE interstage 1:1 for min. 15mA?

I'm looking for options for a SE interstage for the driver stage of a 300b SET.

The tube I'll actually be using is 4P1L at anything from 15mA to 20mA. Could stretch that to 25mA but not necessary. The plate impedence of the 4P1L is around 2K. So I'm assuming approximately 50H inductance. More could be nice.

There must be many reading this who have experience with various options and it would be great to have your contributions.

So far:
Hammond 126C, 105H, 15mA. - Works and sounds pretty good.
LL1660/18mA. - This is better - cleaner and more detailed treble and more air.

Possibilities:
- Lundahl LL1660, 1694A, 1671, 1635 etc
- Hashimoto A105 - A-105
- Silk I-511S SACThailand
- Tango NC20F - Thomas Mayer recommends this

Feel free to add more possibilities. I have 126C already so looking for real quality here, so probably not e.g. Edcor unless someone is bowled over by them. I'm also in the UK so US products will incur shipping + tax.

Andy
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Old 31st July 2012, 04:48 PM   #2
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Hi Andy,

you mentioned my favorite already. The Tango NC20F is among the very best for this application.

My second choice would be the LL1692A which I prefer over the LL1660 in this application.

Best regards

Thomas
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Old 31st July 2012, 04:48 PM   #3
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Old 31st July 2012, 05:01 PM   #4
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Hi!

another good alternative is Tribute. Pieter can wind something close to the Tango NC20

Thomas
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Old 31st July 2012, 05:07 PM   #5
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The Sowter 8424 looks the part, but expensive at 120. Any user comments on sound quality?

LL1692A is about 105 Euros so a bit cheaper - I've used the 10mA version and like it. As Thomas says, a bit nicer than the LL1660.

Hashimoto A105 is $596 a pair. Tango even more. That's a lot more than Lundahl. I'm wondering what you get that's noticeably better sound.

Andy
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Old 31st July 2012, 05:08 PM   #6
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Yes - Pieter is a very good idea. Good quality. I know he has a waiting list though. I've often thought of using his stuff.

Andy
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Old 31st July 2012, 05:21 PM   #7
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Bartolucci Ricerca e Sviluppo - Bartolucci Transformers - Products List - Interstage Transformers Type
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Old 31st July 2012, 05:36 PM   #8
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Bartolucci makes some very nice transformers IMLE..
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Old 1st August 2012, 08:32 AM   #9
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Hi Kevin!

You must have heard a lot of interstage transformers, including the Lundahls. What specific model would you go for as a 1:1 with 15-20mA current?

Have you also heard the Bartolucci INT.6/7, for instance?

Andy
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Old 1st August 2012, 09:42 AM   #10
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TRANS-013/03-C -> 3,392.76 each....
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