ok so i have been working on my amp and i did a classic stupid thing and accidentally hooked up a 8ohm speaker to the 4ohm tap but really quickly shut it off like 3-5 seconds after powering it with only 12v 😡
. what could the damage be or could i have blown my OPT?🙁 is there a way to test it?😕 i feel angry at myself for making this mistake and i have spent alot of money on the transformer.
Regards
Aran
. what could the damage be or could i have blown my OPT?🙁 is there a way to test it?😕 i feel angry at myself for making this mistake and i have spent alot of money on the transformer. Regards
Aran
Don't worry. There's no way that would blow the transformer. The easiest way to test it is to connect the speaker to the 8 ohm tap and confirm it works.
cheers, have you ever accidentally done something wrong then it doesn't even work after and you have invested a lot of money into it?
Aran
Aran
I've been lucky so far. I built a SE amp that requires a 6V6 output valve and then inexplicably ordered a 6L6 - but it seemed to work fine. When I did some measurements I found it was producing more output power than expected, and then I realised!
The thing I do repeatedly is solder jack plugs etc. and then realise afterwards that I should have slotted the body of the plug on to the cable first!
The thing I do repeatedly is solder jack plugs etc. and then realise afterwards that I should have slotted the body of the plug on to the cable first!
haha i can only imagine! sadly i got the output tube fired up and got no signal and then relised the heaters did not power, then i did some fiddling with the OPT and the tube glows, then i wire it to the schematic and now it dosent glow again so i thought maybe the OPT would not allow current to pass into the anode which would have an affect on the cathode and the heaters maybe so that could be the reason 🙁
Aran
Aran
Hooking up an 8 Ohm speaker to a 4 Ohm tap is not such a bad idea.
When the "tube doesn't glow" then your heater supply is not hooked up or working. It has nothing to do with anything else.
Oh my life..
Just disconnect the primary of the output Transformer and measure the resistance across it..
Calm down and check everything you have done carefully make sure you have all the connections correct on the tubes and output transformer.
Regards
M. Gregg
Just disconnect the primary of the output Transformer and measure the resistance across it..
Calm down and check everything you have done carefully make sure you have all the connections correct on the tubes and output transformer.
Regards
M. Gregg
yeah i know but why it seems to die when i hook up the transformer dazzzles me. the pins on the output tube are a bit crusty and i gently rubbed them with a sharp blade to remove the enamel but still no luck...
Aran
Aran
Did you hook up the transformer and heater supply to the right pins?
And what "enamel" is on the pins??
Check if you get a reading on the secondary (good) and also check if you get a reading from primary to secondary bad).
Check continuity of the heater wire/filament.
Check if the heater supply is hooked up to the heater pins.
Check if the heater supply is putting out a voltage.
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ok will do. i think im just going to give the whole thing a break as i have been working so hard on it and getting no results - just failures. everything is matched to the schematic its just one problem after the other...
Aran
Aran
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