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[email protected] badonemusic@gmail.com is offline
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Default John Hardy IM200 Modules

Hate to hit this board over a decade later but two of these modules recently popped up on a site and I'm super close to convincing my boss to buying them. He says that if I find out details on getting them serviced and racked that it's a done deal. Can anyone point me in the right direction as far as how much it would cost and who would be the man for the job? Any help would be greatly appreciated.
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John Williamson John Williamson is offline
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Default John Hardy IM200 Modules

On 14/01/2018 22:39, Scott Dorsey wrote:
In article ,
wrote:
Hate to hit this board over a decade later but two of these modules recentl=
y popped up on a site and I'm super close to convincing my boss to buying t=
hem. He says that if I find out details on getting them serviced and racked=
that it's a done deal. Can anyone point me in the right direction as far a=
s how much it would cost and who would be the man for the job? Any help wou=
ld be greatly appreciated.


I'd call John Hardy. I don't know how well he supports stuff that old,
but he's a good guy and if he doesn't he is likely to know who does.
--scott

When he was interviewed in 2000, he said he still supported them.

--
Tciao for Now!

John.
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John Hardy John Hardy is offline
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Default John Hardy IM200 Modules

On 1/14/2018 4:43 PM, John Williamson wrote:
On 14/01/2018 22:39, Scott Dorsey wrote:
In article ,
* wrote:
Hate to hit this board over a decade later but two of these modules
recentl=
y popped up on a site and I'm super close to convincing my boss to
buying t=
hem. He says that if I find out details on getting them serviced and
racked=
that it's a done deal. Can anyone point me in the right direction as
far a=
s how much it would cost and who would be the man for the job? Any
help wou=
ld be greatly appreciated.


I'd call John Hardy.* I don't know how well he supports stuff that old,
but he's a good guy and if he doesn't he is likely to know who does.
--scott

When he was interviewed in 2000, he said he still supported them.


I still support the IM-200 modules. I still have the original test
fixture that I built to test them. These modules were the main module in
two consoles (Front-of-house and stage-mix) that I designed and built
for db Sound of Chicago in 1977, specifically for the Fall/1977 tour of
the group Kansas.

Having said that, I think I have a module or two from someone that sent
them in a long time ago, still needing a check-up.

I will NOT provide frames, etc., to rack them. Long ago there was a guy
who put the IM-200 modules in outboard cases with separate power
supplies, but he did a crap job of it. There were problems that turned
out to be bad power supplies and other issues not related to the modules
themselves.

I can provide a pin-out of the edge connector and a schematic of the module.

Note that these modules use the highest-ratio Jensen mic input
transformer, the JE-115K-E (now known as the JT-115K-E). All of my mic
preamps since then have used the lowest-ratio Jensen mic input
transformer, the JT-16-B (same as the "A" except for the having a square
shield can instead of a round can). The lower the ratio, the better the
performance - wider bandwidth, lower distortion, more linear phase
response, etc. The trade-off is, you don't get as much voltage gain from
the low-ratio transformer as you do from the high ratio one. The ratio
should be matched to the noise characteristics of the op-amp (or vacuum
tube) that comes directly after the transformer.

The IM-200 uses the first of the Signetics NE5534 op-amps to arrive in
the USA in 1977 (date code 7733 and 7734), originally known as the
Philips TDA1034 as it was available in Europe. There was a high failure
rate of close to 20% over the first weeks and months of the two consoles
being put into service by db Sound for the Fall of 1977 tour of the
group Kansas. All of my mic preamps since then have used the 990
discrete op-amp.

Because of the very different input transformers and very different
op-amps, do NOT expect the IM-200 to sound like an M-1, M-2 or Jensen
Twin Servo 990 Mic Preamp. The laws of physics prohibit that.

I originally ordered Bourns series-80 pots for these consoles. But a
couple of weeks after the order was placed, I was overruled by John
Robson, the head of the sound crew. He insisted that we use Allen
Bradley MOD pots, which became noisy within a few years. Something wrong
with the wiper design, or lubrication, or something. I do not have
replacement pots. The best thing I can do is to drill a tiny hole in the
side of each resistive module and spray contact cleaner inside and hope
for the best. It usually helps, but more cleaner needs to be sprayed
inside from time to time.

Some modules can be in poor shape. They are now 41 years old. Buyer beware.

I cannot say how much it will cost to check them out and make any
repairs until I see them. I typically UNDER-charge for labor for repairs
to my products, way less than I would charge for anyone else's products.
I don't have time to repair anyone else's products anyway.

The IM-200 and the consoles overall were remarkable cool (IMHO) for the
era, and served db Sound very well for many years, for Kansas, Cheap
Trick and many others.

John Hardy
The John Hardy Co.
www.johnhardyco.com
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John Williamson John Williamson is offline
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Default John Hardy IM200 Modules

On 15/01/2018 03:16, John Hardy wrote:
On 1/14/2018 4:43 PM, John Williamson wrote:
On 14/01/2018 22:39, Scott Dorsey wrote:
I'd call John Hardy.* I don't know how well he supports stuff that old,
but he's a good guy and if he doesn't he is likely to know who does.
--scott

When he was interviewed in 2000, he said he still supported them.


I still support the IM-200 modules. I still have the original test
fixture that I built to test them. These modules were the main module in
two consoles (Front-of-house and stage-mix) that I designed and built
for db Sound of Chicago in 1977, specifically for the Fall/1977 tour of
the group Kansas.

Big snip for brevity

John Hardy
The John Hardy Co.
www.johnhardyco.com


Thank you for that information. Not many makers still support stuff that
old. ;-)

--
Tciao for Now!

John.
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Ty Ford[_2_] Ty Ford[_2_] is offline
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Default John Hardy IM200 Modules

missed not seeing you at AES, John.

Hope you're swell.

Ty


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John Hardy John Hardy is offline
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Default John Hardy IM200 Modules

On 1/15/2018 8:11 AM, Ty Ford wrote:
missed not seeing you at AES, John.

Hope you're swell.

Ty

All is well here. Maybe this year for AES. I keep meaning to call you. I
got your phone message weeks ago...

John
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Ty Ford[_2_] Ty Ford[_2_] is offline
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Default John Hardy IM200 Modules

All is well here. Maybe this year for AES. I keep meaning to call you. I
got your phone message weeks ago...

John


Good to know. good to know.

Ty
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Default John Hardy IM200 Modules

On Monday, January 15, 2018 at 3:22:33 PM UTC-5, John Hardy wrote:
On 1/15/2018 8:11 AM, Ty Ford wrote:
missed not seeing you at AES, John.

Hope you're swell.

Ty

All is well here. Maybe this year for AES. I keep meaning to call you. I
got your phone message weeks ago...

John


Just purchased a pair of these that need to be serviced.
Very nice to find out I can send them to you to get dolled up.

Be Well

Apple Tooth Wallace
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