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Thunderbird Club

Well, I can stop sweating now. Played 45 minutes with the Sunn Concert Bass amp connected to an Ampeg 210av cabinet and there was no cut out. So, given all the tests and combinations I've run, pretty sure that the 215m cabinet is the issue. I guess it will take some inspection time when I get back from India.
 
Well, I can stop sweating now. Played 45 minutes with the Sunn Concert Bass amp connected to an Ampeg 210av cabinet and there was no cut out. So, given all the tests and combinations I've run, pretty sure that the 215m cabinet is the issue. I guess it will take some inspection time when I get back from India.
Percussive maintenance?
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@Chucky Stiletti So, got the correct cables 14 gauge, OFC. I tried the Sunn first and found that I had to turn down the volume on the amp from 5 to 3 so I didn't have to have my CP at 1. Got half way through chugging the first song and it cut out. Immediately shut it off.

Next fired up the MM and the volume was significantly lower. Didn't touch the amp settings but had to turn the CP from 7 to almost 10. Sounded fine. No cut out.

Tomorrow I'll try my Ampeg 210av cabinet with the Sunn head and see if I hurt my baby or if the 215m just needs some love.
going right back to the initial suspicion of a bias adjustment/thermal issue….turn the amp on connected to nothing (no speaker, instrument etc) and put your hand on the back (on the heat sink if there is one, don’t recall) and feel for heat….if it warms up shut it off. if it doesn’t warm up, connect the speaker and repeat….if it stays cool hook up an instrument cable with no instrument and repeat….this should give some good clues….the volume variations you experienced upon changing cables don’t sound right…..fishy…
 
Well, I can stop sweating now. Played 45 minutes with the Sunn Concert Bass amp connected to an Ampeg 210av cabinet and there was no cut out. So, given all the tests and combinations I've run, pretty sure that the 215m cabinet is the issue. I guess it will take some inspection time when I get back from India.
that’s good! measure the Sunn box with an ohmmeter next…
 
Awesome! Much better focus. I can actually tell that it has four strings.:D
Seriously, that’s quite a nice bass Mike. Many here (including me) would love to have that one. Nice pic too. :thumbsup:
TY. :) And closer examination reveals the purple silks.:smug:
 
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going right back to the initial suspicion of a bias adjustment/thermal issue….turn the amp on connected to nothing (no speaker, instrument etc) and put your hand on the back (on the heat sink if there is one, don’t recall) and feel for heat….if it warms up shut it off. if it doesn’t warm up, connect the speaker and repeat….if it stays cool hook up an instrument cable with no instrument and repeat….this should give some good clues….the volume variations you experienced upon changing cables don’t sound right…..fishy…
Nice big heat sink. No noticeable heat after a few minutes under each condition.

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