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Old 27th May 2010, 04:14 PM   #1
JoshK is offline JoshK  Canada
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Join Date: May 2004
Location: Toronto, ON
Default 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


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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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Old 28th May 2010, 12:22 PM   #2
limono is offline limono  United States
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Josh, did you find suitable OPT for your GM70 amp?
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Old 2nd June 2010, 06:40 PM   #3
JoshK is offline JoshK  Canada
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Location: Toronto, ON
I had some custom made from Electra-print.
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Old 16th June 2010, 05:31 PM   #4
JoshK is offline JoshK  Canada
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Join Date: May 2004
Location: Toronto, ON
bump
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Old 22nd June 2011, 01:59 PM   #5
JoshK is offline JoshK  Canada
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Join Date: May 2004
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bump
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Old 22nd June 2011, 04:07 PM   #6
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I'm also looking for OP transformers for GM70 tube.
Greetings
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Old 22nd June 2011, 04:29 PM   #7
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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
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Old 22nd June 2011, 04:34 PM   #8
JoshK is offline JoshK  Canada
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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.
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Old 22nd June 2011, 08:54 PM   #9
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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
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Old 30th November 2011, 01:49 PM   #10
JoshK is offline JoshK  Canada
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Join Date: May 2004
Location: Toronto, ON
BTW, I still have these and now am in Toronto, ON.
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