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8 ohm resistor on output sparks tubes
8 ohm resistor on output sparks tubes
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Old 11th October 2019, 11:31 AM   #11
mandu is offline mandu  Singapore
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Join Date: May 2010
For the other amp you mentioned, Chances are that there was no signal on the amp or there is a small capacitor (0.001uf) across OT to suppress hiss.
If the OT is well insulated, sparks will appear across tube sockets or inside output tubes if driven without speaker connected.

Last edited by mandu; 11th October 2019 at 11:38 AM.
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Old 11th October 2019, 12:07 PM   #12
BJosephs is offline BJosephs  United States
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Join Date: May 2011
Location: Bridgewater Ma, USA
It could also be as simple as the non-sparking amp has output jacks wired to short if left unconnected.
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Old 11th October 2019, 07:06 PM   #13
Gnobuddy is offline Gnobuddy  Canada
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Join Date: Mar 2016
Quote:
Originally Posted by 6V6dude View Post
...another amp I've also build, with that one I can unplug the speakers and nothing happens. Found out by accident where I've turned it on by mistake without speakers connected for a whole day.
To me, that sounds a bit like "I left my 2-month old baby balanced on a bar stool for 30 minutes, and she didn't fall off and get injured. I can leave my baby on a bar stool and nothing happens."

In other words, nothing bad happened the first time. What will happen the next time?


-Gnobuddy
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