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Old 15th February 2007, 05:05 PM   #1
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Default Crown IC-150A POOGE

The Crown IC-150A Preamplifier is one of those early 1970's devices with beaucoup of room in the chassis -- and it used an LM301 opamp -- the IC-150A has a stepped attenuator, tone, balance and a "panorama" control, abundant use of Siemens silvercaps -- here's the linestage and power supply -- while it is a thing of beauty, it must undergoe the surgeon's knife:

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and

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Old 15th February 2007, 06:13 PM   #2
anatech is offline anatech  Canada
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Hi jackinnj,
Quote:
while it is a thing of beauty, it must undergoe the surgeon's knife:
Go for it! They didn't sound that good either. Between upgrading the power supply and other active stages, is there anything but the chassis worth keeping?

-Chris
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Old 15th February 2007, 06:58 PM   #3
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the chassis and front panel are very nice construction. the transformer seems to be of the UTC variety -- they have all of the inputs grounded onto the chassis so i purchased some insulated Au-plated variety to fit in there. the attenuator is of very high quality.

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Old 15th February 2007, 07:10 PM   #4
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Hi jackinnj,
Are you thinking discrete or another op amp unit?
Quote:
they have all of the inputs grounded onto the chassis so i purchased some insulated Au-plated variety to fit in there.
I probably would have gone with Ag or some other finish. Gold doesn't seem to hang around long on most jacks I've seen.

-Chris
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Old 15th February 2007, 07:17 PM   #5
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sure would like to see a picture of the insides ...

Is there room for a torrid xformer? alternate pre-amp boards? possibly an EQ board? are those IC volt regulators in the PS diagram? (Is that a Nixie pilot light? = the unsung hero of high freq. on the AC voltage filters.)

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Old 15th February 2007, 07:19 PM   #6
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I've repaired more of these over the years that I would admit...but in reality the chassis is probably the only good part of it. I'd use it for a good tube line stage.
Mark
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Old 15th February 2007, 07:51 PM   #7
anatech is offline anatech  Canada
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Hi FastEddy,
Quote:
Is there room for a torrid xformer?
Why? EI's sidestep many torroid problems and there isn't a height issue here.

Hi Mark,
Quote:
I've repaired more of these over the years that I would admit...but in reality the chassis is probably the only good part of it.
I've done a few as well. I think I'd stick with a solid state unit. Use an old computer hub for a tube project, complete with visible tubes hanging out the top!

-Chris
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Old 15th February 2007, 09:42 PM   #8
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Quote:
Originally posted by anatech
Hi jackinnj,
Are you thinking discrete or another op amp unit?

I probably would have gone with Ag or some other finish. Gold doesn't seem to hang around long on most jacks I've seen.

-Chris
I am going to use this combination of AD825 + AD826 for the line amp.

I think that the phono board is going to be OK.

The power supply will get a pair of super-regs.

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Old 16th February 2007, 12:48 AM   #9
anatech is offline anatech  Canada
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Hi jackinnj,
Ah ha! A composite op amp. Less expensive maybe than BUF04. This should be interesting to see how it plays out. I'm sure it will perform considerably better than the orginal.

Quote:
The power supply will get a pair of super-regs.
Yup. Can't hurt.

-Chris
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Old 16th February 2007, 12:57 AM   #10
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Where are your tone controls?
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