Hashimoto Se Output Transformer
Has anyone had experience using these HASHIMOTO SE OUTPUT TRANSFORMER H-203S output transformers?
Very nice looking and quite affordable.
More information can be seen here:
http://www.obsinc-products.com/servlet/Categories?category=Transformers:Output+-+Single+Ended
Any feedback is appreciated.
dr._sleep
Has anyone had experience using these HASHIMOTO SE OUTPUT TRANSFORMER H-203S output transformers?
An externally hosted image should be here but it was not working when we last tested it.
Very nice looking and quite affordable.
More information can be seen here:
http://www.obsinc-products.com/servlet/Categories?category=Transformers:Output+-+Single+Ended
Any feedback is appreciated.
dr._sleep
, but plan on putting these trannies in my mono blocks as soon as I feel up ot it 
Hi dr._sleep,
Just wondering if you ever decided on the Hashimoto OPT's? I replaced my Hammond 1627's with the H-20-3.5U's a few weeks ago and have been very pleasantly surprised with the difference in the sound. Highs are more extended, mids seem more, I don’t know, perhaps more liquid and the bass region is tighter. The Hammonds seemed to have a bit more slam in the bass regions, but IMO music through the Hashimoto’s sounds much improved. I don’t know if I can explain this correctly, but during one song by the group Foreplay, I can hear the piano notes resonate for what seems like seconds longer than with the Hammonds.
Other than chasing a hum tied to using unshielded wire on my signal line and a few unsightly holes in my chassis due to the smaller size of the Hashimoto, the swap went real smooth.
Regards,
Danny
Just wondering if you ever decided on the Hashimoto OPT's? I replaced my Hammond 1627's with the H-20-3.5U's a few weeks ago and have been very pleasantly surprised with the difference in the sound. Highs are more extended, mids seem more, I don’t know, perhaps more liquid and the bass region is tighter. The Hammonds seemed to have a bit more slam in the bass regions, but IMO music through the Hashimoto’s sounds much improved. I don’t know if I can explain this correctly, but during one song by the group Foreplay, I can hear the piano notes resonate for what seems like seconds longer than with the Hammonds.
Other than chasing a hum tied to using unshielded wire on my signal line and a few unsightly holes in my chassis due to the smaller size of the Hashimoto, the swap went real smooth.
Regards,
Danny
http://www.iol.ie/~waltonaudio/mk2300bmk1.html
from: http://www.iol.ie/~waltonaudio/menu.html
I'm a toob noob myself, so I really can't comment (nor afford) WE300b's. Just from researching for my own amp, KR Audio and TJ-Mesh plates seem to have a strong following.
-Good luck.
Danny!
If I'd like to build the JE LABS 300B SE, and I'd like to use the Hashimoto H-20-3.5U (instead of A.N.3K on the schematic), can I change any original parameters? (resistors, voltage, capacity)
Which primary are you using of Hashimoto? 2.5K or 3.5K?
Thx,
Cartman
Attachments
Hi cartman,
I am currently running with the 2.5k connection. I will be trying the 3.5k connection over the next few weeks just to hear the difference. As far as changing out other components, other than removing the volume pot, I left resistor and cap values the same as schematic.
Hope this helps.
Danny
I am currently running with the 2.5k connection. I will be trying the 3.5k connection over the next few weeks just to hear the difference. As far as changing out other components, other than removing the volume pot, I left resistor and cap values the same as schematic.
Hope this helps.
Danny
Stick to the original circuit, the parts are faily accurately calculated, its based on the williamson amplifier driver stages.
Its a bit thick sounding due to all that 2nd harmonic, but is one of the better 300b driver stages.
300b's are notorioiusly sensitive to their drivers, it can make or break them.
Best is pentode or cascading circuits, avoid others I have tried them all.
srpp is kak, ok to get it going, tho', nice and simple, mu is a bit better.
Its a bit thick sounding due to all that 2nd harmonic, but is one of the better 300b driver stages.
300b's are notorioiusly sensitive to their drivers, it can make or break them.
Best is pentode or cascading circuits, avoid others I have tried them all.
srpp is kak, ok to get it going, tho', nice and simple, mu is a bit better.
Check out this design Cartman. It's pentodes driving 300B's and considered to be among the very best designs with 300B's. In this Thorstein Loesch redesign it seems (feedback from those who have built it) the old WE91 really comes to life:
http://www.audioasylum.com/forums/tubediy/messages/71898.html
Aril (a 'soon to build' and fan of WE91)
http://www.audioasylum.com/forums/tubediy/messages/71898.html
Aril (a 'soon to build' and fan of WE91)
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