Crown IC-150A POOGE

jackinnj · 15th February 2007, 05:05 PM

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:

and

anatech · 15th February 2007, 06:13 PM

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

jackinnj · 15th February 2007, 06:58 PM

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.

anatech · 15th February 2007, 07:10 PM

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

FastEddy · 15th February 2007, 07:17 PM

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.)

Mark A. Gulbrandsen · 15th February 2007, 07:19 PM

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

anatech · 15th February 2007, 07:51 PM

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

jackinnj · 15th February 2007, 09:42 PM

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.

anatech · 16th February 2007, 12:48 AM

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

mikeks · 16th February 2007, 12:57 AM

Where are your tone controls?

15th February 2007, 05:05 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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: and

15th February 2007, 07:17 PM	#5
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	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.) __________________ Over compression is a problem with modern CD recordings

15th February 2007, 07:19 PM	#6
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	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 __________________ KSA-100 WIKI

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15th February 2007, 06:58 PM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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.

16th February 2007, 12:57 AM	#10
mikeks Account Disabled Join Date: Jun 2004 Location: Animal farm	Where are your tone controls?

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