Hashimoto SE Output Transformer

[dr._sleep]

Hashimoto Se Output Transformer

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

 

[Rocky]

I hope you didn't got tricked by the fact they are priced per piece not per pair.. Looks good though, and $500 plus shipping from Japan isn't all that bad either.. But in that price range it still has to compeat with AE, Tribute, Tango...

 

[Ciscokid]

Hi,
No experience yet, but I just picked up a pair of Hasimoto H-20-3.5U's while in Tokyo last week. Still jet lagging , but plan on putting these trannies in my mono blocks as soon as I feel up ot it 😉

Regards,
Danny

 

[dr._sleep]

Thanks, I was looking at the 203S, 7 watts, for an EL34 SE amp.
They are $165 each and the company that distributes them is in the US. $165 beats Sowter, Electroprint, etc.

I may have to take a chance on them.

dr._sleep

 

[Ciscokid]

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

 

[cartman]

Hi Danny!

What is your amp details?

300B SE?

thx,
cartman

 

[Ciscokid]

Hi cartman,

I built the JELabs 300b circuit using Hammond 1627 transformers. I then swapped out the OPTs with Hashimotos and am really enjoying the tunes.

Take a look and my poor excuse of a web site for some photos. Sorry, but I have not uploaded any photos of the new iron.

dg

 

[Ciscokid]

Hi cartman,

I uploaded a few pictures of the Hashimoto H-20-3.5U transformers installed in my monoblocks for you viewing. Take a look at my site and drill into upgrades under jelabs300b monoblocks.

Thanks,
Danny

 

[cartman]

Thx Danny,



GREAT!!!

 

[cartman]

Which type of your capacitors?
Especially the audio signal .22uF?

What do you thik the Audio Note 300B schematic?

(I'm looking for the "best" schematic...) 😕

 

[kstylianos]

Which type of your capacitors?
Especially the audio signal .22uF?

I just picked up a pair of Auricaps from Euphonia for ~11/piece. Some other folks like using a small PIO or Blackgate here also. A search on 'Auricap' and/or 'coupling' will get you good results.

I'm using the Walton MKII schematic which is a revised power supply variant of the JELabs.

 

[cartman]

kstylianos!

Thanks for your help...

Can you share with me the exact schematic what u're using?

My other question:

What do you think about the new produced WE 300B tubes from year 2006?
Is this worse than older?

thx!

 

[kstylianos]

Can you share with me the exact schematic what u're using?

http://www.iol.ie/~waltonaudio/mk2300bmk1.html

from: http://www.iol.ie/~waltonaudio/menu.html

What do you think about the new produced WE 300B tubes from year 2006?

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.

 

[Ciscokid]

Hi Cartman,

Which type of your capacitors?
Especially the audio signal .22uF?

The coupling cap is an Angela Aluminum Foil Paper In Oil cap.
The PSU caps are ASC poly and oil.

What do you thik the Audio Note 300B schematic?

Sorry, I only have experience with the JELabs schematic.

Hope this helps,
Danny

 

[cartman]

Thanks Guys for the infos!

If I have further questions, I will ask...

Thx again!
Cartman

 

[cartman]

Sorry, I only have experience with the JELabs schematic.

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

 

[Ciscokid]

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

 

[lt cdr data]

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.

 

[cartman]

Have you any exact schematic for better driver stage to 300B?

Thx,
cartman

 

[WE91]

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)