Burning Amplifier BA-1

[nightrush]

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.

[digits]

Thanks I can get the CL60 from RS but its not very cheap and minimum order of 5.

[Alettagla]

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

[gmant123]

Hi, someone could measure the total current per channel?

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

Thanks

[AndrewT]

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?

[gmant123]

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?

[AndrewT]

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.

[lbaggio]

I need pcb´s 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 pcb´s and matched transistors.
It could be a preamp n .

[Itsmee]

At the top of the page, there's a link to the diyAudio store where you can buy BA1/2/3 boards.

[timbarnes]

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...







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