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Old 15th April 2013, 12:42 PM   #1
gthang is offline gthang  United Kingdom
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Default Output Transformers for SSE

While I'm waiting for my SSE board to arrive, I've been looking into the parts I need to buy. I'd like to use KT88 valves and quite fancy using Lundahl transformers. (One of the reasons for wanting to try Lundahl is I can buy in Europe and avoid shipping and import taxes, plus they are supposed to be VG quality.

Am I correct in saying this transfomer will work?http://www.lundahl.se/pdf/1663.pdf
it is 5K to 8ohms however it is only 8w.

Does anyone know if any other Lundahl transformers are suitable with a bit more power 15w?

I guess Ideally I'd like to find something with in the Lundahl range similar to this EDCOR - CXSE25-8-5K

I intend to use the amp with my Jordan JX92S single driver (no crossover) speakers and they do like a bit of power.


Thanks for any pointers, I'm totally new to this and finding the transformer selection and bit of a nightmare.

Last edited by gthang; 15th April 2013 at 02:08 PM.
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Old 15th April 2013, 05:50 PM   #2
rknize is offline rknize  United States
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Since you are planning to use KT88s, it is OK to go for a lower primary impedance. Perhaps this one?

http://www.lundahl.se/pdf/1679.pdf
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Old 15th April 2013, 08:52 PM   #3
gthang is offline gthang  United Kingdom
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Thank you, I can see the 1679 is 4.5ohms and 20w. Unfortunately they are quite a lot of money.
Are there any other manufactures (apart from Edcore and Hammond) I could consider? I can't think of any other brands of transformer...
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Old 16th April 2013, 12:12 AM   #4
rknize is offline rknize  United States
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Wouldn't Sowter be closer to you?

Edit: looks like SE09 would be a good match. Expensive, though. I don't know what your budget is.

Last edited by rknize; 16th April 2013 at 12:20 AM.
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Old 16th April 2013, 07:53 AM   #5
gthang is offline gthang  United Kingdom
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Thanks I'll have a look at Sowter,
Budget it what ever it takes to do a good job, as this is my 1st ever DIY amp project, it's just as much about the journey as it is the destination.
I had in mind approx 300 for all the transformers, (power, output and choke) However If I have to spend more to get it right then that's ok.

Last edited by gthang; 16th April 2013 at 07:57 AM.
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Old 16th April 2013, 08:29 AM   #6
zman01 is offline zman01  Bangladesh
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gthang,

Sowter and Lundahl are definitely good choices.

From overseas, one source which can give you power, output, and choke is Edcor.

Transcendar (Home - Transcendar Audio Transformers) has OPTs and choke.

There are other sources like Antique Electronic Supply that will be able to provide you what you need.

If you get from single source, probably your shipping will be optimized. A pair of good OPTs should be around 10-13 lbs, a power transformer another 9-10 lbs and choke 2-4 lbs.

Not light these and you will need to consider shipping charges (+ duties, taxes if any).
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Old 17th April 2013, 08:29 PM   #7
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I've wondered if the $100 a piece Magnequest RH (Robin Hood)-60s would be a good choice?

From the Magnequest site:

"Robin Hood Series RH-60
$99 each
5,000 ohm pri with 43% UL tap
8 and 16 ohm secondaries
60 madc unbal current capacity
30 henries of primary L
10 watts @ 45 hz (-3db low freq pwr. response)

small signal frequency response (varies a bit with source impedance) should be good from about 25 hertz to 30,000 hertz minimum.

Recommended Applications:
first example from WE for 300B
plate volts 350
grid bias -76
dc plate current 50 madc
5000 ohm load impedance
6.2 watts output
second and third HD; -30db and -45db respectively

second example from WE for 300B
plate volts 400
grid bias -87
dc plate current 60 madc
5000 ohm load impedance
8.3 watts output
second and third HD; -30db and -46db respectiv"
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