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11
Q & A / Re: Blowing fuses after re-wiring for a three conductor power cord.
« Last post by Stratmanx on October 01, 2017, 09:59:57 am »
I've enclosed this shot, not the best, but coupled with the drawing should give you an idea.


http://fenderforum.com/userphotos/index.html?recid=83545


So the way I've got it wired is the Neutral (White) goes directly to the 2nd connection on the power switch.

 The black (Hot) goes to the fuse, then to the black wire on the transformer, then the other black wire on the transformer goes to the 1st connection on the power switch.

 The Ground (Green) goes directly to the chassis.

 I also ran a hot wire (The red one with the capped off end) to the number three connector on the switch to light the power lamp

 What's the best way to test the primary / secondary windings ?

 Thanks !

12
Q & A / Blowing fuses after re-wiring for a three conductor power cord.
« Last post by Stratmanx on October 01, 2017, 08:48:02 am »
I went ahead and snipped out the death cap and polarity switch and rewired for the three conductor plug.

However I keep blowing fuses when turning on the power switch.

I've blown them with all the tubes in place, as well as removing all of them, including the rectifier tube, so it tells me I'm missing something simple in the 1st stage of the power delivery.

(Hoping my transformer isn't shot !)

I would really appreciate if someone could check out if I've done this properly.

This is how I've got it presently wired:

http://fenderforum.com/userphotos/index.html?recid=83540

I also wired it like this to hopefully light the power lamp and it did illuminate briefly before blowing the fuse:

http://fenderforum.com/userphotos/index.html?recid=83541


This is the power section of the Sentura I schematic:

http://fenderforum.com/userphotos/index.html?recid=83543


Full Sentura I schematic:

http://fenderforum.com/userphotos/index.html?recid=83544


Thanks folks !




13
Q & A / Re: Sunn model 9
« Last post by Isaac on September 30, 2017, 08:34:12 am »
Interesting in what way?
14
Q & A / Re: Sunn model 9
« Last post by Technojay on September 29, 2017, 09:40:52 am »
Well, a neighbor wanted to make room and I was more than willing to help him take a pair of Model 9's off him for a hundred dollars. I ran a pink noise test and there is an interesting curve around 8k on both of them. I plan to run it through PEQ and see if straightening the peak would improve musicality.
15
Classified / Re: Looking to Buy Concert Slave!
« Last post by Blight Moth on September 29, 2017, 07:35:43 am »
Thanks dude! I saw it too, got really excited til I saw the price lol $500, wow. I'm watching it, maybe they'll take less.

There's one cheap in Bakersfield right now if anyone needs one. The guy absolutely will not ship, though.
17
Q & A / Re: 1979 Sunn Concert Bass Schematic
« Last post by loudthud on September 25, 2017, 08:24:06 pm »
There is no all on one sheet schematic for the later Concert Bass that I have found. This should be the power amp schematic. I have the preamp somewhere but I can't find it ATM.
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Q & A / 1979 Sunn Concert Bass Schematic
« Last post by cosnerguitars on September 25, 2017, 01:04:55 pm »
Hi I'm looking for a 1979 Sunn Concert Bass Schematic. I found one on various websites but this one appears to be somewhat different.  Mine has a single bridge rectifier with discreet diodes, and the ones on the net seem to show 3 separate bridge rectifiers.  Mine also seems to have a 47k resistor and neon lamp in parallel with the main switched power supply.  Any help would be greatly appreciated!
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Classified / Looking to Buy Concert Slave!
« Last post by Blight Moth on September 24, 2017, 10:25:58 pm »
Just looking for a Concert Slave to go with my Concert Lead.  Hoping I will have some luck here! Thanks
20
Q & A / Re: Original Two Prong Power Cord
« Last post by N2000s on September 23, 2017, 07:13:21 pm »
Thanks!...  but one has been found. Still a good idea to replace yours though:)
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