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24th April 2003, 06:08 PM
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#1 |
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diyAudio Member
Join Date: Mar 2003
Location: Randers
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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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24th April 2003, 06:45 PM
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#3 |
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diyAudio Member
Join Date: Mar 2003
Location: Randers
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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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24th April 2003, 06:59 PM
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#4 |
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diyAudio Moderator Emeritus
Join Date: Jun 2002
Location: U.K.
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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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24th April 2003, 07:09 PM
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#5 |
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diyAudio Member
Join Date: Aug 2001
Location: Sweden (Mora)
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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 I´m putting them to use in a 6AQ5/EL90 amp. |
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24th April 2003, 07:23 PM
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#6 |
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diyAudio Member
Join Date: Mar 2003
Location: Randers
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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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24th April 2003, 07:39 PM
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#7 |
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diyAudio Moderator Emeritus
Join Date: Jun 2002
Location: U.K.
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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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24th April 2003, 11:04 PM
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#8 |
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diyAudio Senior Member
Join Date: Aug 2002
Location: Belgium
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AI.
__________________
Frank |
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6th April 2004, 08:59 PM
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#9 | |
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diyAudio Member
Join Date: Apr 2004
Location: Bedfordshire, UK
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Re: Output valves
Quote:
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