Jump to content

Recognise this Amplifier Module?


Sub Sonic

Recommended Posts

I was having a look at this home made amplifier module, and was wondering if anyone recognises it?

It is built in dual mono, has 66V rails, and looks to be an Electronics Australia board. One channel is blowing fuses, I suspect it may be a bridge rectifier.

It was originally used as a PA amp, and I was eyeing off the enclosure and parts for another amp project but was wondering if it's worth keeping as it is.

Pics:

post-133526-0-26529800-1356162459_thumb.post-133526-0-87191800-1356162484_thumb.

post-133526-0-09734000-1356162497_thumb.post-133526-0-25171600-1356162512_thumb.

post-133526-0-82385800-1356162520_thumb.

Cheers!

SS

  • Like 1
Link to comment
Share on other sites

This is the EA Playmaster Pro Series One Power Amplifier.

140 WRMS per channel @ 8 Ohm, 180 WRMS per channel @ 4 Ohm

Here are pictures of the one I built when the kit first came out circa 1989

I built both the Pro Series One Power Amp and the Pro Series Two Pre Amplifier ... these served as my main amps for nearly two decades.

I still have them ... although they are retired now from active duty :)

post-103929-0-94332800-1356186843_thumb.

post-103929-0-16139600-1356186866_thumb.

post-103929-0-67336600-1356186886_thumb.

post-103929-0-83953500-1356186903_thumb.

post-103929-0-70187500-1356186924_thumb.

  • Like 3
Link to comment
Share on other sites

You're Welcome SS

It's agood amp ... operationally it's quiet and it has plenty of grunt.

Many years ago it fried the woofers of my Audax speakers (that I still use today) during a party we had when someone turned the volume up a little bit too much after some alcoholic beverages :P

Sound wise it's not in the same league as my Valve amp or even my old Marantz 4140.

While it sounds nice enough it misses out on the finer nuances of better quality amps.

I guess maybe a good way to describe it is if you threw a veil over your speakers ... the music is there but it just doesnt "engage" you if you know what I mean.

Link to comment
Share on other sites

Thanks Sierra,

I know what you mean, it sounds like it might find itself back on the shelf.

Unfortunately, no matter how much I like an amp or pair of speakers, if the SQ isn't up there it just won't get used.

I might fix it up and have a listen just out of curiosity though.

Regards,

SS

Link to comment
Share on other sites

  • 2 years later...

Hi SS. 

Did you find some schematics for your Playmaster Pro Series amp?  Researching the application of the Hitachi TO-3 and TO-3P MOSFETS, I managed to purchase a set of magazines and have scanned the amplifier articles.  I also have the later Pro Series 3 using the 2SJ162/2SK1058 and the 300 watt version using 3 pairs.  Let me know if you need a file.

Link to comment
Share on other sites

Those Hitachi 2SJ49's are very hard to short even when pushing the amplifier beyond its rated limits. First amplifier looks like a simple dual mono design but with no relays or protection with output and anything that will drift into red zone so watch out for how loud you push the amp.

Edited by DefQon
Link to comment
Share on other sites

This is the EA Playmaster Pro Series One Power Amplifier.

140 WRMS per channel @ 8 Ohm, 180 WRMS per channel @ 4 Ohm

Here are pictures of the one I built when the kit first came out circa 1989

I built both the Pro Series One Power Amp and the Pro Series Two Pre Amplifier ... these served as my main amps for nearly two decades.

I still have them ... although they are retired now from active duty :)

attachicon.gifPro Series 1 01.JPG

attachicon.gifPro Series 1 02.JPG

attachicon.gifPro Series 1 03.JPG

attachicon.gifPro Series 1 04.JPG

attachicon.gifPro Series 1 05.JPG

 

Lovely neat and clean build there.  So nice to see you took considerable care in its construction.  Easy to see why it lasted over two decades and still going strong.   :)  :thumb:

 

Cheers,

Alan R.

  • Like 1
Link to comment
Share on other sites

  • 9 years later...
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...
To Top