Holden and Fisher toroidal transformers - diyAudio
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Old 28th July 2006, 03:41 AM   #1
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Default Holden and Fisher toroidal transformers

Quote:
Originally posted by Colin
I wonder what happened to the Holden and Fisher transformers Naim used to use?
Speaking of these, does anyone have any info on them? I just had some land here and am looking to categorize them... a couple must be on the order of >600 VA.

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Old 28th July 2006, 03:31 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
they will still be inside the amplifiers that Naim built.
Over here in the UK, Holden & Fisher have a very good reputation.
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Old 29th July 2006, 12:06 AM   #3
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I'll snap some pics later... these trafos have had a long trip back to me. I bought them in the early 80s (along with a number of Crimson Amp modules), then i got "out of audio" and passed them on to a friend. Now he is moving in with a new GF and has to rationalize his stash.

I have 2 monsters (+ maybe another the same in a built-up amp with 300W crimson modules) , a pr much smaller (guess 200-300VA) and a single (guess 150-250VA). It will be easy enuff to figur the voltages, but a good estimate of VA would be nice as well as knowing how easy it will be to spearate the common if they are terminated V-0-V instead of V-0, 0-V...

I also have one -- i guess -- in my NAIT 2.

dave
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Old 29th July 2006, 08:44 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
I think you will find that Holden & Fischer are slightly heavier than the equivalent VA from ILP (who are they now?).

Are they black fabric wrapped? Increased damping (less noise?) or increased emissivity (run cooler?)

It should be very simple to unwrap the area next to the lead outs and separate the two secondaries. Do they have a potted core? That's more difficult!

The primary will be separately wrapped under the secondaries so your mains safety will not be compromised IF you take care not to damage the primary and it's wrapping.

Crimson 3004 series 7 or series vii? I think the 3004 was only available as a series 7.
Has it got two pair of 3773s or three pairs? Are they still 3773s?

Crimson's grounding/earthing instructions in the blue A5 manual are not optimum nor were the later A4 photostated (or fotostatted?) literature.
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Old 29th July 2006, 09:00 AM   #5
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Andrew,

Do they have a website ?
Have you had anything from them before ?


Cheers,
Patrick
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Old 29th July 2006, 09:07 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
only two of my amps have H & F.
They were generally so much more expensive than other cheap UK sourced transformers that I never bought any H & F.

I think they are still operating.
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Old 29th July 2006, 11:10 AM   #7
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Holden & Fisher LTD.
64/72 Glantaner Rd.
Balmore
Glasgow G22 7SZ
041-335-0547

ILP has become Amplimo a long time ago.
H&F used to be the transformer brand of many big audio boys in the 1980s, also US brands, for some reason Holden & Fisher lost its share. Beautiful toroids, the black cloth wrap is marvelous.
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Old 29th July 2006, 05:48 PM   #8
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Quote:
Originally posted by AndrewT
Are they black fabric wrapped?...Do they have a potted core?
Black fabric wrapped & a potted core....

dave
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Old 29th July 2006, 05:49 PM   #9
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Quote:
Originally posted by jacco vermeulen
Holden & Fisher LTD.
64/72 Glantaner Rd.
Balmore
Glasgow G22 7SZ
041-335-0547
They are still in biz? If i snail mail or phone them, there is someone at the other end?

dave
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Old 29th July 2006, 06:30 PM   #10
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picture....
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File Type: jpg holden-fisher-toroids.jpg (84.3 KB, 547 views)
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