Bi-Pak AL60

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M Gregg

M Gregg

Disabled Account
Joined 2010
#1
Just wondering,

Has anyone got a link to a schematic for these modules?
They are old now..but I thought I would ask..

Regards
M. Gregg
 

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#4
djk said:
Should take you about 10 minutes to look at the board and draw the schematic from it.
Click to expand...

Your right of course..😀
A few more pics found..🙂

I know the output transistors can be TIP41A<< I built this board as a big stereo one piece (DIY) years ago with a PSU, but I lost all the info..but the smaller ones..and the one in the middle of the heat sink..Good fun at the time..😀
The photo when expanded is about the same size as the original PCB..They don't exist anymore..

Regards
M. Gregg
 

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#5
The nice thing about these modules was it only needed a simple PSU.

Simple Transformer rec and cap would run them..😀
Bolt them to a heat sink and that was it. Even the chassis would do it..😀
I used the 470uF with 8 Ohm speakers at the time..

Regards
M. Gregg
 
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#6
AL60 possible fun from the 70's

After a lot of help,
The original drivers were Tr5 BFS98 and Tr6 BFS61
Tr3 was BC171A<<in the middle of the heat sink.
In the past I used TIP41A output transistors.

Here is the result.🙂 Board traced out..what a PITA..😀
Transistors on the drawing are suggested types.

Regards
M. Gregg
 

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#13
Hi,

I'm very much a novice but I've just bought a couple of these modules (eBay). I wanted to try something different to the ubiquitous Chinese (and more recently Sri Lankan (STK4191)) kits. So, have I dropped a clanger (bo***ck) or will these build to a reasonable quality (not audiophile) amp.

Any help or suggestions appreciated, even if it's to chuck them, after all they only cost me about 17 quid plus P&P. 🙂

Cheers,

Graham
 
#14
You might be pleasantly surprised by just how good these can be.

The old electrolytics should be replaced and also the suggestion of M Gregg to fit 0.22 ohm emitter resistors could be worthwhile because the bias stability looks like it could be marginal.
 
#15
Hi Mooly,

Thanks for the reply. I had it in mind to replace the electrolytics, are there any other pitfalls to look out for?

I don't know why I bought these, maybe they reminded me of something from my Dad's Practical Wireless magazines.

Cheers,

Graham
 
#17
I have got the original circuit for the AL60 and AL125. I used the AL60 for my mobile disco for many years as well as the AL125 really reliable. They were made by Autona or Bi Pak as far as I remember. I later replaced the bd 911 with tip3055 on the AL60.
Honestly I love the sound from them much better than today's class d and h stuff
 
#18
I know this is an old thread but just had to tell someone..! Whilst rooting around in an old spares box looking for something else, I came across an old AL-30 module. These were the 10w version. On a whim, I hooked it up to the bench supply and a test speaker and CD player. I was pleasantly impressed! The sound is very 'direct' and punchy with none of the soft muddiness of a lot of the modern stuff.It was a great find. I guess I must have bought this one (one of a pair) back when I was about 16! I remember seeing the AL-60 and the AL-125 advertised. Way out of my price range and power concept back then! 🙂
 
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