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Old 14th July 2011, 09:33 AM   #231
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Using Thermistors as shown in the article should be sufficient.

For my two 500VA-transformers I put this between the two primary windings (115V each).

However, if you can easily get those CL60 from where you live, use them. For me, it would have been too complicated.
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Old 14th July 2011, 07:59 PM   #232
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Thanks I can get the CL60 from RS but its not very cheap and minimum order of 5.
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Old 19th July 2011, 07:03 AM   #233
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What is not very cheap. In case you can only get 5 May be we could arange you sent two of them over to me....depending on where you are and how much additional costs that will bring
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Old 5th October 2011, 01:55 AM   #234
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Default Current

Hi, someone could measure the total current per channel?

I have two PT 25-0-25V 250VA can serve for this amp??

Thanks
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Old 5th October 2011, 12:25 PM   #235
AndrewT is offline AndrewT  Scotland
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Hi,
the 250VA 25+25Vac transformer has a maximum continuous current rating of 5Aac.

When using a capacitor input filter after the rectifier. the maximum continuous DC current rating is ~2.5Adc.
The amplifier continuous DC current draw must not exceed 2.5Adc and for cool running I recommend that the continuous operational current be limited to ~50% of maximum rating, i.e. <=~1.3Adc continuous.

What is the current draw of your amplifier?
How many channels do you want/need to supply from this transformer?
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Last edited by wintermute; 6th October 2011 at 07:57 AM. Reason: edit at Andrews request.
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Old 6th October 2011, 02:07 AM   #236
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Default PT

Hi Andrew, thank you for reply.

Still is a project, I am collect the parts and wish know if the transformer that already have could work.

I have two of these 25-0-25V 250VA PT and maybe could use one per channel?

On the other hand though I have seen that the circuit operates at 25VDC, NP has published distortion curves at 32V too, the same circuit might work with 32Vdc?
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Old 6th October 2011, 07:57 AM   #237
AndrewT is offline AndrewT  Scotland
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If Pass says use 25Vdc then you need a very good technical reason for adopting any different voltage. Your 25+25Vac transformer will not give +-25Vdc.
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Old 11th October 2011, 02:30 PM   #238
lbaggio is offline lbaggio  Brazil
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Default Oh Lord, won't you buy me a Mercedes-Benz?

I need pcbs to build a "full stereo version" i.e. stereo gain stage + bias board + output set (ALEPH 3 or a BA 1.

How or from whon could I buy these pcbs and matched transistors.
It could be a preamp n .
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Old 11th October 2011, 10:46 PM   #239
Itsmee is offline Itsmee  England
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At the top of the page, there's a link to the diyAudio store where you can buy BA1/2/3 boards.
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Old 21st October 2011, 04:20 AM   #240
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Default My next project...

I'm really enjoying my BA-3 front end and F4 power stage.

I can't help wondering if bi-amping my speakers wouldn't be a good idea.

Looking in my garage I found these...

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

And I have a couple of big black heatsinks weighing me down.

So I'm thinking maybe a BA-1 would be the thing to do.

My plan would be to feed both the F4 and BA-1 from the BA-3.

I guess I'd need to run the transformer with primaries in series on the 100V taps: this should give me almost 22V peak to peak.

I haven't compared the IRF244 with the IRF240 yet - hopefully they will substitute OK. I think these parts were mostly gifts from Nelson at the very first Burning Amp: it's been a while getting a plan for them.

Is this madness? Any thoughts?

tim
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