Anyone with an ampzilla

RogerG · 11th April 2005, 12:50 AM

I am working on an ampzilla II. The bias ic has a 4 transistor array. This one is shorted and took out the outputs. I know in the original 'zilla, there was no ic for setting the bias. Have you ever converted one? Also, what effect would lowering the bias a little have? If you have rebuilt one, what problems did you run into?
Thanks
Roger

djk · 11th April 2005, 01:05 AM

The original IC used in the Ampzilla was the CA3086, all later models used the MPQ6100.

An open bias IC would take out the outputs, not a shorted one. The shorted outputs took out the bias IC (unless you did not have it in contact with the heatsink).

The stock bias level is fine.

RogerG · 11th April 2005, 01:18 AM

Quote:

Originally posted by djk
An open bias IC would take out the outputs, not a shorted one. The shorted outputs took out the bias IC (unless you did not have it in contact with the heatsink).

Sorry, got that backwards. It set a speaker on fire when it let go. Pretty scary day! I would like to make the bias control a trimpot if I can. If not, I need new ic's. They're hard to run down around here.

Roger

djk · 11th April 2005, 02:09 AM

It has a trim pot for the bias, R307.

Contact Us

J&K Electronics Inc.
11-4 OLD DOCK ROAD
YAPHANK, NY 11980
631-205-0005 FAX:631-205-9489
TOLL FREE 1-866-4JKELECT
Contact us by E-Mail

Don't like flames? Build a crowbar.

BrianL · 11th April 2005, 03:17 AM

It has been years since I looked at an Ampzilla and their
magic "proprietary" chip, which as stated was an off-the-shelf
transistor array. I'm sure you could replicate the functionality
with a fairly normal Vbe multiplier, though you should reverse
engineer the original circuit (given a schematic of the interior
of the transistor array) to be sure.

RogerG · 12th April 2005, 04:40 AM

Quote:

Originally posted by djk
Contact Us

J&K Electronics Inc.
11-4 OLD DOCK ROAD
YAPHANK, NY 11980
631-205-0005 FAX:631-205-9489
TOLL FREE 1-866-4JKELECT
Contact us by E-Mail

Thank you. I will call. Who should I speak with?

Quote:

Originally posted by BrianL
It has been years since I looked at an Ampzilla and their
magic "proprietary" chip, which as stated was an off-the-shelf
transistor array.

If this chip is relyable, I don't mind replacing it with new ones. I just want to be sure that someone has not found a conventional retrofit for it.

Roger

djk · 12th April 2005, 11:54 PM

That's just an ad from a search on the generic MPQ6100, give them a call.

ACK electronics in Atlanta used to have them too.

11th April 2005, 12:50 AM	#1
RogerG diyAudio Member Join Date: Apr 2005 Location: Atl, Ga	Anyone with an ampzilla I am working on an ampzilla II. The bias ic has a 4 transistor array. This one is shorted and took out the outputs. I know in the original 'zilla, there was no ic for setting the bias. Have you ever converted one? Also, what effect would lowering the bias a little have? If you have rebuilt one, what problems did you run into? Thanks Roger __________________ It's only dumb if you don't ask!

11th April 2005, 03:17 AM	#5
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	It has been years since I looked at an Ampzilla and their magic "proprietary" chip, which as stated was an off-the-shelf transistor array. I'm sure you could replicate the functionality with a fairly normal Vbe multiplier, though you should reverse engineer the original circuit (given a schematic of the interior of the transistor array) to be sure. __________________ bel

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11th April 2005, 01:05 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	The original IC used in the Ampzilla was the CA3086, all later models used the MPQ6100. An open bias IC would take out the outputs, not a shorted one. The shorted outputs took out the bias IC (unless you did not have it in contact with the heatsink). The stock bias level is fine.

11th April 2005, 02:09 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	It has a trim pot for the bias, R307. Contact Us J&K Electronics Inc. 11-4 OLD DOCK ROAD YAPHANK, NY 11980 631-205-0005 FAX:631-205-9489 TOLL FREE 1-866-4JKELECT Contact us by E-Mail Don't like flames? Build a crowbar.

12th April 2005, 11:54 PM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	That's just an ad from a search on the generic MPQ6100, give them a call. ACK electronics in Atlanta used to have them too.

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