Acoustic 320

[AudioMan]

Hi,

1st post and new member here.

I have been asked to repair an Acoustic 320 bass amplifier. I obtained a schematic similar to post #2 on page 29.
However, the schematic is not the clearest, but better than nothing.
QUESTION: Does anyone here have a more complete schematic for this amp?

My 320 has a front panel jack labelled "Switched" which I didn't find on the schematic, possibly due to that portion cut off during copying.
Another apparent change is that the rear jack "Preamp Combined IN" is not connected to the power amp input board. I can see where the wire is cut. It is re-wired to the "Preamp A IN" jack.
Another obvious change is that the 750 mH inductor of the Equalizer board is replaced by 3-turn piece of wire! The 3H inductor is replaced with an off-board-blob-of-something encased in silicon, or hot glue.

I am working to restore this amp to its original state and working order.
Thanks,

Peter.

[Jazz P Bass]

I am not at all clear what "schematic similar to post #2 on page 29" means.

Here is the schematic that is available on this site: http://music-electronics-forum.com/a...c-320-330_.pdf

[Enzo]

I'll look at my files when I get to the shop. I see what you mean by cut off.

[AudioMan]

I am not at all clear what "schematic similar to post #2 on page 29" means.

Here is the schematic that is available on this site: http://music-electronics-forum.com/a...c-320-330_.pdf

When you click on Forum -> Schematic Requests, there are 90 pages as of today. If you look on page 29 and post #2, you will find the schematic you link to.
Secondly, the scan is done as a "black & white" document, so a crease or paper fold can look as a line on the schematic, causing confusion. Component values can also be hard to read. It is certainly useable, but I was looking for a clearer version - which I was not able to find.

Thanks for responding.

Peter.

[Jazz P Bass]

How about posting a link to the schematic.

(right click, 'copy shortcut', past it here.

Is the one that I posted the same, different, better, worse........

[Enzo]

Oh dear lord, I hope you didn't look through all those pages. There is a search function upper right n the page here.

[AudioMan]

Oh dear lord, I hope you didn't look through all those pages. There is a search function upper right n the page here.

Sometimes you need the right syntax in a "search" to find what you are looking for. I have found items that the Forum Search engine didn't see but were still there. Yes, I looked through every one of the 90 pages because I don't trust forum "search" engines. Secondly, being new here, I didn't want to be accused of being lazy.

Jazz: http://music-electronics-forum.com/a...c-320-330_.pdf Same as far as I can tell.

[g1]

To search the forum, do a google search, then click the gear button and choose "advanced search". Scroll down and you can specify the "site or domain". Specify music-electronics-forum.com in that line. Now click the advanced search button.
It's light years beyond the forum's search function, and will find what you are looking for.

[AudioMan]

Thanks g1.
I've heard of this method before but forgotten how to use it.
I must write it down on a sticky note to remind me.
I like the google search engine.

Edit: It took a lot, lot, less time than my method, and gave the same results in a few seconds.

[g1]

The alternate way is to include the following line (in google search box) after your search term and a space:
site:music-electronics-forum.com

[nsubulysses]

To search the forum, do a google search, then click the gear button and choose "advanced search". Scroll down and you can specify the "site or domain". Specify music-electronics-forum.com in that line. Now click the advanced search button.
It's light years beyond the forum's search function, and will find what you are looking for.

Thanks for posting this again. I know you have before and it is necessary as the forum search rarely gives any satisfaction
I needed it for that Traynor thyrector scenario I was trying to sort a few days ago.

[g1]

That's exactly how I found that thryector.pdf file that Jazz had posted long ago.