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Old 13th January 2012, 08:45 PM   #1
pilovis is offline pilovis  Italy
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Default Single ended at 24Vcc 1+1W @ 8 ohm - three tubes

My new project

The performances are incredibly good in spite of such a low supply voltage.

Tubes: one 12FQ7 (or ECC82 with lower gain) and two PL504

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PL504

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ECC82 - 12FQ7

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Last edited by pilovis; 13th January 2012 at 09:03 PM.
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Old 13th January 2012, 09:03 PM   #2
dhaen is offline dhaen  Europe
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Interesting concept. What are you using as output transformers? I wondered about 100v line transformers...

Edit: of course they're not gapped doh...
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Old 13th January 2012, 09:07 PM   #3
pilovis is offline pilovis  Italy
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You can use Audio Transformers 600/8 ohm impedance (best results), or if you accept a little bit more distorsion and lower bandwidth, you can use line transformers 220/24 Vac not less than 35W power each.

Last edited by pilovis; 13th January 2012 at 09:11 PM.
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Old 13th January 2012, 09:10 PM   #4
DF96 is offline DF96  England
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Sorry to be dumb, but what is the point? You wanted to run a valve amp from the 24V battery supply of a lorry?
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Old 13th January 2012, 09:15 PM   #5
pilovis is offline pilovis  Italy
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I use it connected to my laptop that has 24 Vcc power supply.
Laptop tube amp.
It still works quite well at 19Vcc (Acer Laptop), but it is better to use a dedicated laptop universal power supply at 24Vcc.

Last edited by pilovis; 13th January 2012 at 09:31 PM.
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Old 13th January 2012, 09:19 PM   #6
pilovis is offline pilovis  Italy
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you could also use it at 12Vcc with a CC 2 CC car voltage doubler (12to24)

Last edited by pilovis; 13th January 2012 at 09:32 PM.
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Old 13th January 2012, 09:33 PM   #7
gcwills is offline gcwills  Australia
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Well done Pilovis - Creative approach with your amp
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Old 13th January 2012, 10:02 PM   #8
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Quote:
Originally Posted by DF96 View Post
Sorry to be dumb, but what is the point?
Because we can?
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Old 13th January 2012, 10:28 PM   #9
DF96 is offline DF96  England
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OK, each to their own!
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Old 13th January 2012, 10:29 PM   #10
gcwills is offline gcwills  Australia
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Any photos of your amp Pilovis?
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