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Old 28th October 2011, 07:40 AM   #341
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http://www.diyaudio.com/forums/attac...a-amp-full.zip
Sorry for errors, that's Q14.15 and now MJE15032/3 though either pair would suit
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Old 28th October 2011, 09:24 AM   #342
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Originally Posted by Ian Finch View Post
http://www.diyaudio.com/forums/attac...a-amp-full.zip
Sorry for errors, that's Q14.15 and now MJE15032/3 though either pair would suit
Q13 I used 2sc3953 transistor as Q13. Thats the transistor in the middle of the heatsink used for temperature compensation I think. I used MJE15032/3 for drivers Q14/15 and the MJE15033(Q15) are the ones that blew as well as some power transistors. I am having the feeling that some of the transistors I bought may have been fake.

Repeet I think I will take you up on your offer. It would be nice to meet a fellow diyer in my same town.
PM sent Repeet

Regards

Simon

Last edited by niss_man; 28th October 2011 at 09:34 AM.
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Old 28th October 2011, 02:08 PM   #343
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Originally Posted by niss_man View Post
Have tested power supply without being connected to amplifier board and I get +ve and -ve 61v rails and bulb is not on. (ok)

When connected to amplifier boards +/-ve 50vdc and bulb is on very very slightly(hardly glowing)?
Theres some issue with my amplifier board somewhere.
What is the best place to start now? Maybe remove the power transistors and driver transistors and see if input bumps back up to 60v?

Edit Just found a shorted Q15 driver transistor.

Another question. Is it ok to use a 2sc3953 transistor as Q13??
Regards

Simon
If driver is shorted I'd guess outputs blown. Replace all outputs and drivers. Use complimentary devices don't mix n match. In the meantime after you've put all new devices in you can then test the old ones hfe etc to determine which are ok and which are not.

It is normal for unloaded trafo voltage to be higher than loaded voltage but ten volts is too much.
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Old 28th October 2011, 02:32 PM   #344
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Originally Posted by odysseybmx414 View Post
It is normal for unloaded trafo voltage to be higher than loaded voltage but ten volts is too much.

...also use a lower wattage lamp initially for the lamp tester, e.g. 40 W, to get more than a 'hardly glow'.

(The voltage drop will be even more than 10 V with the lower wattage lamp, but that is the idea).
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Old 29th October 2011, 10:59 PM   #345
Variac is offline Variac  United States
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diyAudio Central, in the person of JojoD818 has made an etched pair of boards and will do a test build. When he confirms that it works well, we'll get on with the order. After sending in the order it takes about 6 weeks to get in the store.
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Old 30th October 2011, 02:19 PM   #346
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diyAudio Central, in the person of JojoD818 has made an etched pair of boards and will do a test build. When he confirms that it works well, we'll get on with the order. After sending in the order it takes about 6 weeks to get in the store.

I've checked the board against the schematic and all seems where they should be, unless something slipped my tired eyes.

Anyway, like Variac said, I've started making preparations for a test build of this amp. Will post pics of the board soon... Drilling holes tomorrow, most part I hate when doing PCBs...
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Old 31st October 2011, 08:11 AM   #347
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Progress from diyAudio Central...

Click the image to open in full size.


Click the image to open in full size.


Click the image to open in full size.

Next is the daunting task of drilling them holes...
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Old 31st October 2011, 09:52 AM   #348
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Let's hope you don't get the same failure I experienced after putting one of these together jojo.

Regards

Simon
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Old 1st November 2011, 01:07 AM   #349
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Let's hope you don't get the same failure I experienced after putting one of these together jojo.

Regards

Simon
I hope so too. Are you rebuilding yours?
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Old 1st November 2011, 04:03 AM   #350
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Happy Halloween everyone!




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