Recent Posts

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11
Q & A / Re: Inexpensive speaker repair suggestion.
« Last post by eddiemac on May 22, 2018, 06:54:41 am »
I would try a light application of epoxy glue, to the crack only  - just enough so it stays solidly together.
12
Q & A / Re: Original Model T questions.
« Last post by _peter on May 22, 2018, 03:56:40 am »
Hi,

it's a first generation and it looks stock. Why do you think it has been modified?

Best,
Peter
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Q & A / Re: Inexpensive speaker repair suggestion.
« Last post by RacerX on May 21, 2018, 07:58:17 pm »
Sorry, pictures from iPhone load as incompatible.
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Q & A / Inexpensive speaker repair suggestion.
« Last post by RacerX on May 21, 2018, 07:54:33 pm »
Hello,  I have a Sunn Beta 402 that I have let set for a long time. I went to use it and noticed all four speakers have identical cracks. Only one crack per speaker, and all are the same. I was pressing on the cone to get the separation seen in the picture. The material actually closes up tight without any pressure on it. I need inexpensive repair so someone can use it long enough to try my amp or I can make a short video to demastrate it. I understand it would be best to replace or recone them but it looks like the value of a Beta 402 would only be worth what it would cost to properly repair it, or even less with shipping’s . I was thinking of using some fingernail polish or latex caulking?  I also read in a post where a guy said to lightly spray the cones with lacquer to refresh them. So I was wondering if maybe there is a material like felt, I could embed in the crack and use some lacquer as an adhesive. Any advice would be appreciated. Thank you in advance.
15
Q & A / Re: Sunn Sorado Coupling Caps
« Last post by Soundmasterg on May 20, 2018, 11:35:32 am »
Its a subtle thing, but the effect is clearly there. Its up to taste...use whichever one you like better.

Greg
16
Q & A / Re: Cone Excursion
« Last post by Ryan Phelps on May 20, 2018, 08:09:40 am »
Yes, it's an electrolytic. It's common practice to replace cathode caps when re-capping an amp. Electrolytics have a limited life-span and this cathode cap is pretty inexpensive, so I would replace it.
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Q & A / Re: Cone Excursion
« Last post by eddiemac on May 19, 2018, 10:15:29 am »
I replaced the green .0022uF coupling cap with a new Sozo mustard cap of the same listed value.  My Fluke meter reads 3nF on the old cap and 2nF on the new.  I notice an improvement with regard to speaker bass handling now.

Question:  Is that 250uF cathode bypass cap an electrolytic?  It seems to be working fine, but will it need to be replaced some time in the future? 
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Q & A / Re: Sunn Sorado Coupling Caps
« Last post by eddiemac on May 19, 2018, 09:54:22 am »
Well, I've got to agree that the .1uF caps yield a slightly tighter bass sound (more punch, clarity?).  I tried the .25uF original value at a gig and, two weeks later at the same venue, the .1uF. 
19
Q & A / Re: Original Model T questions.
« Last post by RacerX on May 19, 2018, 09:37:27 am »
Thanks Isaac! I will print it out and compare it to my amp.  I would assume mine is a 1G since it was made in 1974. This is a picture of my amp in case anyone is familiar with the Model T and can tell if it is stock or has been modified just by looking at it.
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Q & A / Re: Original Model T questions.
« Last post by Isaac on May 18, 2018, 11:45:21 am »
Here's the original Model T:

http://www.prowessamplifiers.com/schematics/post/sunn_model_t.pdf

The second generation Model T (2G) is somewhat different, and lots of people modify a 2G to make it more like the 1G. I can't say how that affects the value.
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