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Old 11th April 2005, 12:50 AM   #1
RogerG is offline RogerG  United States
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Default 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
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Old 11th April 2005, 01:05 AM   #2
djk is offline djk
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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.
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Old 11th April 2005, 01:18 AM   #3
RogerG is offline RogerG  United States
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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
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Old 11th April 2005, 02:09 AM   #4
djk is offline djk
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It has a trim pot for the bias, R307.

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J&K Electronics Inc.
11-4 OLD DOCK ROAD
YAPHANK, NY 11980
631-205-0005 FAX:631-205-9489
TOLL FREE 1-866-4JKELECT
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Old 11th April 2005, 03:17 AM   #5
BrianL is offline BrianL  United States
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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.
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Old 12th April 2005, 04:40 AM   #6
RogerG is offline RogerG  United States
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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
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Old 12th April 2005, 11:54 PM   #7
djk is offline djk
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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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