Found retro 80s amp - Anyone know what this is?

tiffin4tea · 12th February 2009, 09:22 PM

Sorry to be such a noob but I found this amp and have no idea what is is other than I think its from the late 70s early 80's. Theres no model number so I think it must be a kit amp of some kind. Sorry no inside pics.
It looked like it had 2 transformers inside it?

Can anyone shed some light onto this about what it might be and if I could use it as a stereo amp with a couple of 1994 ish technics speakers?

pacificblue · 13th February 2009, 09:47 AM

No outside pics either?

tiffin4tea · 14th February 2009, 10:55 AM

now with pics

Puffin · 14th February 2009, 01:50 PM

It looks like it was designed for PA or similar use, with the jack plug inputs. It is not likely to perform that well in a domestic environment. However if it works, power it up and see what it sounds like. Any speaker of 4, 6 or 8 ohms should be fine. If you are unsure as to it's stability, use an old speaker to check it is o.k.

poynton · 14th February 2009, 02:02 PM

6 mike inputs, 1 gram 1 other

could be mike transformers in the cans?

could be a toroid 100v line transformer?

What are the transistors mounted on the back panel ??

Andy

pjp · 14th February 2009, 04:45 PM

Where are the large capacitors ? I see just one.
Where's the other one, or if it is a single supply where are the output capacitors ?

teemuk · 14th February 2009, 07:10 PM

Maybe it's transformer coupled...? I see two huge transformers and this does not look like a stereo amp - neither an amp that would need two parallel transformers of that size.

djk · 15th February 2009, 02:16 AM

PA amplifier with a single ended supply. Will have all NPN outputs push-pull driving a center-tapped output transformer with the B+ fed to the center tap. Probably 100W into a 70V or 100V line.

12th February 2009, 09:22 PM	#1
tiffin4tea diyAudio Member Join Date: Feb 2009	Found retro 80s amp - Anyone know what this is? Sorry to be such a noob but I found this amp and have no idea what is is other than I think its from the late 70s early 80's. Theres no model number so I think it must be a kit amp of some kind. Sorry no inside pics. It looked like it had 2 transformers inside it? Can anyone shed some light onto this about what it might be and if I could use it as a stereo amp with a couple of 1994 ish technics speakers?

13th February 2009, 09:47 AM	#2
pacificblue diyAudio Member Join Date: May 2008	No outside pics either? __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

14th February 2009, 02:02 PM	#5
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	6 mike inputs, 1 gram 1 other could be mike transformers in the cans? could be a toroid 100v line transformer? What are the transistors mounted on the back panel ?? Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

15th February 2009, 02:16 AM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	PA amplifier with a single ended supply. Will have all NPN outputs push-pull driving a center-tapped output transformer with the B+ fed to the center tap. Probably 100W into a 70V or 100V line. __________________ Candidates for the Darwin Award should not read this author.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

14th February 2009, 10:55 AM	#3
tiffin4tea diyAudio Member Join Date: Feb 2009	now with pics

14th February 2009, 01:50 PM	#4
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	It looks like it was designed for PA or similar use, with the jack plug inputs. It is not likely to perform that well in a domestic environment. However if it works, power it up and see what it sounds like. Any speaker of 4, 6 or 8 ohms should be fine. If you are unsure as to it's stability, use an old speaker to check it is o.k.

14th February 2009, 04:45 PM	#6
pjp diyAudio Member Join Date: Nov 2006 Location: under the rainclouds	Where are the large capacitors ? I see just one. Where's the other one, or if it is a single supply where are the output capacitors ?

14th February 2009, 07:10 PM	#7
teemuk diyAudio Member Join Date: Nov 2004 Location: Suomi, Finland	Maybe it's transformer coupled...? I see two huge transformers and this does not look like a stereo amp - neither an amp that would need two parallel transformers of that size.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
retro marantz	karma	Solid State	25	6th June 2004 06:05 PM
Balance Pot, (=retro?)	Cobra2	Everything Else	2	1st December 2003 09:25 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read