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Old 30th June 2004, 12:09 PM   #1
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Default Hammond or James OPT for SE 300B ?

Which OPT , a Hammond or James , would be suitable for a SE 300B amp. Is the James audibly far superior to the Hammond ?

I want to keep costs sensibly down. Since this is experimental in nature , I don't want to go overboard. But the iron is really crucial here. Any opinions on this choice ?
Thanks,
Ashok.
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Old 30th June 2004, 12:20 PM   #2
benny is offline benny  Australia
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hi,

hammond trannies are good value for money. the 30Hz to 30kHz freq. range specs are at full rated power, so this is pretty decent considering their price...

i have not heard James trannies, so canot coment, but i get the feeling they are considered superior to hammonds but are more expensive? so i guess it's a question of what's more important... money, or a bit of an improvement in sound.

cheers
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Old 30th June 2004, 12:32 PM   #3
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I prefer James, outstanding performance in compare with Tango.
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Old 30th June 2004, 04:12 PM   #4
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Default Weight differences.

This is not a conclusive way of determining the capacity of a transformer , but weight would roughly indicate the amount of core material in a transformer. That would determine it's power handling capacity and possibly it's LF capability.

The James 6123HS weighs 3.2 Kg and the Hammond 1627SE weighs about 5Kg . Apart from slight power handling differences , would this imply that the Hammond will go lower than the James ? Of course the James might use a core that can handle much higher flux and hence use less material in the core resulting in lower weight.
What is the correct explanation?
Thanks.
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Old 30th June 2004, 09:36 PM   #5
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Default OPT

Quote:
Originally posted by redwine1118
I prefer James, outstanding performance in compare with Tango.

I seccond that!
But to be honest, Plitron/Amplimo (Menno van der Veen) is the winner but costs much more than the James OPT.

James transformers looks nice/cute!
And Plitron/Amplimo are well build and to my taste the most beautyfull one.

So if you want to keepcosts low and build a good amp I'd go for James OPT!


Best regards,


Audiofanatic
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Old 1st July 2004, 04:37 AM   #6
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Quote:
I prefer James, outstanding performance in compare with Tango.
Have you measured the performance or have you only compared paper specifications?

I found this on the net which made me wonder...

http://www.sacthailand.com/transformerTest1.html

Quote "James Model JS-6123HS Universal output transformer with EI core that performs far behind Tango U-808" end quote.

Note that Tango U-808 is a low cost transformer with much lower performance than Tango XE-20S.


I have found it almost impossible to compare transformers from the data sheet as manufacturers are not consistent in the way they measure the performance, a classic example is the way to specify primary inductance in push-pull transformers wheter it is at low signal level, at peak magnetic flux or close to saturation, the values achieved are naturally very different and most manufacturers don't even specify the measurement conditions...

Regards Hans
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Old 1st July 2004, 03:23 PM   #7
LeoJar is offline LeoJar  Canada
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Try Hammond. I am now using Hammond and it is better than James (I tried also) in overall but not much. Nice looking doesn't mean good sound.
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Old 1st July 2004, 03:50 PM   #8
coffin is offline coffin  Taiwan
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Hi
James' website:

http://jianshin.myweb.hinet.net/
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Old 1st July 2004, 03:50 PM   #9
secanbj is offline secanbj  Sweden
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Just to add som choices :-)

http://www.diyparadiso.com/lundahl/shoot1.htm
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Old 1st July 2004, 09:54 PM   #10
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James 6123HS is one of the cheapest model. (Mylar insulation)

Mostly for James transformer, if you are looking for better performance model (teflon insulation), try 6133H(T)S, the specification is just like 6123HS with 30W ouptut power. But this model is a tailor make one.
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