IC: Hashimoto 20w 5K/7K Output tranformers

JoshK · 27th May 2010, 04:14 PM

I have a pair of Hashimoto H-20-7U output transformers.
Specs:
Output: 20W at 50Hz
Primary: 5K or 7K Ohms
Secondary: 4, 8, 16 Ohms
FR(+-2dB) 25-70,000Hz

More info: Hashimoto Products

The deal is, I bought these for a project a little while back and I should have asked more questions as these are not appropriate for my big GM70 monoblocks. They have the requisite 7K primary and are rated for 20 watts, but are not gapped for really high current that a GM70 requires. The 5K primary would be ideal for a high-end 300B amp. Then again if you are looking at this ad, and know what these would be used for, I don't need to explain all of this.

These were only taken out of their original boxes to examine. They have never been used, never been soldered. Exactly as new.

These cost $530/pr + $80 shipping (from both tube-amp.net and ebay..same guy). I'll eat both shipping costs and offer them for $500 shipped w/i cont'l 48. I am not forced to sell and would rather keep them for some other project than take a bath on them, so my offer is firm. Thanks for understanding.

limono · 28th May 2010, 12:22 PM

Josh, did you find suitable OPT for your GM70 amp?

JoshK · 2nd June 2010, 06:40 PM

I had some custom made from Electra-print.

JoshK · 16th June 2010, 05:31 PM

bump

JoshK · 22nd June 2011, 01:59 PM

bump

gaborbela · 22nd June 2011, 04:07 PM

I'm also looking for OP transformers for GM70 tube.
Greetings

gaborbela · 22nd June 2011, 04:29 PM

Hello Josk

I do not want to hijack your tread! Rather keep it at the top.
Do you think these transformer would be OK for these project.
EDCOR Electronics Corporation. CXSE25-8-10K
I know the quality not top but latter can be upgrade it if I can successful build the GM-70.
Greetings gabor

JoshK · 22nd June 2011, 04:34 PM

I am no expert. Do you know which op point you want to run at? It looks like that one is gapped enough, but I don't know the voltage rating that one can handle, you'd have to ask if you plan to run ~1kv. Also, I've read a lot of different opinions on better op points for the GM70 between 7k and 10k. No personal experience.

gaborbela · 22nd June 2011, 08:54 PM

Hello

I think Edcor produce with lower primery to. Usually people use around 10K.
I want to run at 930V plate voltage with 100mA bias. Yes it can handle 1KV that not a problem. I'm just not sure if is gaped well enough for these project.
Unfortunately for SE the max is 25W.
I collect the parts to these project to.

Greetings gabor

JoshK · 30th November 2011, 01:49 PM

BTW, I still have these and now am in Toronto, ON.

27th May 2010, 04:14 PM	#1
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	IC: Hashimoto 20w 5K/7K Output tranformers I have a pair of Hashimoto H-20-7U output transformers. Specs: Output: 20W at 50Hz Primary: 5K or 7K Ohms Secondary: 4, 8, 16 Ohms FR(+-2dB) 25-70,000Hz More info: Hashimoto Products The deal is, I bought these for a project a little while back and I should have asked more questions as these are not appropriate for my big GM70 monoblocks. They have the requisite 7K primary and are rated for 20 watts, but are not gapped for really high current that a GM70 requires. The 5K primary would be ideal for a high-end 300B amp. Then again if you are looking at this ad, and know what these would be used for, I don't need to explain all of this. These were only taken out of their original boxes to examine. They have never been used, never been soldered. Exactly as new. These cost $530/pr + $80 shipping (from both tube-amp.net and ebay..same guy). I'll eat both shipping costs and offer them for $500 shipped w/i cont'l 48. I am not forced to sell and would rather keep them for some other project than take a bath on them, so my offer is firm. Thanks for understanding.

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28th May 2010, 12:22 PM	#2
limono diyAudio Member Join Date: Mar 2007	Josh, did you find suitable OPT for your GM70 amp?

2nd June 2010, 06:40 PM	#3
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	I had some custom made from Electra-print.

16th June 2010, 05:31 PM	#4
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	bump

22nd June 2011, 01:59 PM	#5
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	bump

22nd June 2011, 04:07 PM	#6
gaborbela diyAudio Member Join Date: Sep 2005	I'm also looking for OP transformers for GM70 tube. Greetings

22nd June 2011, 04:29 PM	#7
gaborbela diyAudio Member Join Date: Sep 2005	Hello Josk I do not want to hijack your tread! Rather keep it at the top. Do you think these transformer would be OK for these project. EDCOR Electronics Corporation. CXSE25-8-10K I know the quality not top but latter can be upgrade it if I can successful build the GM-70. Greetings gabor

22nd June 2011, 04:34 PM	#8
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	I am no expert. Do you know which op point you want to run at? It looks like that one is gapped enough, but I don't know the voltage rating that one can handle, you'd have to ask if you plan to run ~1kv. Also, I've read a lot of different opinions on better op points for the GM70 between 7k and 10k. No personal experience.

22nd June 2011, 08:54 PM	#9
gaborbela diyAudio Member Join Date: Sep 2005	Hello I think Edcor produce with lower primery to. Usually people use around 10K. I want to run at 930V plate voltage with 100mA bias. Yes it can handle 1KV that not a problem. I'm just not sure if is gaped well enough for these project. Unfortunately for SE the max is 25W. I collect the parts to these project to. Greetings gabor

30th November 2011, 01:49 PM	#10
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	BTW, I still have these and now am in Toronto, ON.

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