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Old 22nd June 2012, 12:59 PM   #801
AndrewT is offline AndrewT  Scotland
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I gave some advice in post751.
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Old 22nd June 2012, 03:16 PM   #802
Krisfr is offline Krisfr  United States
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Quote:
Originally Posted by Stormrider View Post
Right, this is a basic dual emitter follower design. Lower impedance speakers will put a higher load on the VAS than a triple EF output stage would. Simply adding more output transistors would help, but even at +/-70Vdc the VAS will be pushed harder than intended.

The amp was designed around +/-60Vdc rails. Unless you can do the calculations, and modify the design properly yourself, you should build it as the designer intended.
Is there anyone that wants to re-do this design for higher voltage rails and more output devices? Is it even possible?

Also would this design be better with separate front end power supplies?
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Old 22nd June 2012, 03:29 PM   #803
Rob_S is offline Rob_S  United Kingdom
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Thanks both for the replies. Shame there is not a simple tweak for this.

as I have a 45v AC, 1kva may have a look for a different project :-)
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Old 22nd June 2012, 03:59 PM   #804
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45vac x sqrt2 =~ +/-63Vdc. This would be ok for 6-8 ohm speakers assuming a constant mains voltage, and the transformer is of high quality with good regulation.
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Old 22nd June 2012, 04:18 PM   #805
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Quote:
Originally Posted by Rob_S View Post
Thanks both for the replies. Shame there is not a simple tweak for this.

as I have a 45v AC, 1kva may have a look for a different project :-)


Please see my post re the prototype of the HB amp. It uses 45VAC toroidal too.



Quote:
Originally Posted by JojoD818 View Post
The HB prototype currently drives a pair of 6 ohms Wharfdale 9.1 speakers, but it also drove a pair of 4 ohms Dynaudio Audience for about 2 days too. Aside from that, it has driven other bookshelves and floorstanders of different brands.

The secondary of the toroidal I used in the prototype is 45VAC.

So far the amp is still alive.
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Old 22nd June 2012, 04:20 PM   #806
Rob_S is offline Rob_S  United Kingdom
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will be closer to +/-68vdc, just checked its a 230v AC to 45v AC, my mains is currently 246.8v AC. So would be pushing as I don't want to be restricted on speakers.

Thanks for the feedback :-)

Thanks JojoD818 will take a look (saw your post a little on the late side :-) )
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Old 22nd June 2012, 04:24 PM   #807
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Quote:
Originally Posted by Rob_S View Post
will be closer to +/-68vdc, just checked its a 230v AC to 45v AC, my mains is currently 246.8v AC. So would be pushing as I don't want to be restricted on speakers.

Thanks for the feedback :-)

Thanks JojoD818 will take a look (saw your post a little on the late side :-) )

It seems your mains are on the high side, are they like that for the whole day?


You're welcome, you may also find the downloadable official build guide at the store.
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Old 22nd June 2012, 05:50 PM   #808
AndrewT is offline AndrewT  Scotland
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JP,
our UK mains supply is still a nominal 240Vac +-6% although for the sake of Harmonisation it is specified as 216Vac to 254Vac.

246.8Vac is only 2.83% above nominal voltage. That is NOT high. That is well within the specified range and well within the "normal UK" voltage.
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Old 23rd June 2012, 12:09 AM   #809
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Who is JP?

Oh sorry did I say "high"? I thought I said "high side".

But thanks for summing that all up.
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Old 23rd June 2012, 06:49 AM   #810
Harry3 is offline Harry3  Australia
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Guys thanks for the replies.
I just want to clarify - can I add an extra output transistor using 60V rails to easily drive 4 ohm loads? If yes what modifications? Thanks.
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