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Old 24th April 2003, 06:08 PM   #1
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Default Audio Innovations Series 300

Hi all tubelovers

A friend of mine got his hands on this little amp.

The problem is, that after a (very) few minutes, it starts to hum. Quite loud in fact. Changed all the electrolytic caps, they looked kinda done
The hum is still there and I noticed that one of the tube lights more than the others. I believe it's a push-pull amp, so there should be some balance in it.
My quess is, that the tube needs to be changed, but since i'm not into tube ( not saying i don't like them ) i thought i'd ask in here

/Henrik
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Old 24th April 2003, 06:30 PM   #2
dhaen is offline dhaen  Europe
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Hmm,

What's the valve line-up?
The output valves look like ECL86..

Cheers,
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Old 24th April 2003, 06:45 PM   #3
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Default Output valves

John,

Sorry, forgot all about the valves. Your hawkeye tell you right.
ECL86 it is

I have the schematic at work. Will post it tomorrow

/Henrik
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Old 24th April 2003, 06:59 PM   #4
dhaen is offline dhaen  Europe
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Default Hawkeye? Well...

Henrik,

It's not such a feat. The ECL86 is the only audio specific triode-pentode that has a half-height triode section. This is clearly visible on your image.

Regarding the hum, is it on one or both channels?

It should be possible to run a channel (with severely reduced performance) with one output valve, for test purposes.

Cheers,
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Old 24th April 2003, 07:09 PM   #5
Fuling is offline Fuling  Sweden
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Those transformers looks familiar to me.
They look identical to the ones used in the Edison 12 amp.
Made by Partridge, I believe.
I have a couple of those OPT:s and Im putting them to use in a 6AQ5/EL90 amp.
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Old 24th April 2003, 07:23 PM   #6
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John,

I will try and find out regarding the hum tomorrow.
Will try and see what happens when removing one of the tubes as well. Do you have any idea what it will sound like?

/Henrik
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Old 24th April 2003, 07:39 PM   #7
dhaen is offline dhaen  Europe
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Henrik,

Removing one output valve will:
Reduce the gain a little
Cause loss of LF, especially at higher power
Increase distortion

But!... and I hadn't thought of this...
Removing one ECL86 will also remove the triode section which may not be "channelised", so perhaps the sound might dissappear!

Cheers,
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Old 24th April 2003, 11:04 PM   #8
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Default AI.

Hi,

In case weren't able to help you out:

BORDER PATROL.

Cheers,
__________________
Frank
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Old 6th April 2004, 08:59 PM   #9
Stig is offline Stig  United Kingdom
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Default Re: Output valves

Quote:
Originally posted by HenrikKronborg
John,

Sorry, forgot all about the valves. Your hawkeye tell you right.
ECL86 it is

I have the schematic at work. Will post it tomorrow

/Henrik
Is that Audio Innovations Series 300 schematic still available?
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