Anyone with an ampzilla

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RogerG

Member
Joined 2005
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

djk

R.I.P
Joined 2001
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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RogerG

Member
Joined 2005
djk said:
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).
Click to expand...

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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BrianL

Member
Joined 2002
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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RogerG

Member
Joined 2005
djk said:
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
Click to expand...
Thank you. I will call. Who should I speak with?

BrianL said:
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.
Click to expand...
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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