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Old 19th January 2013, 08:52 PM   #1101
6L6 is offline 6L6  United States
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Steve - Wonderful! If your PSU is good you have a much better chance of a successful project.

(And although that sounds obvious, many people just build the whole amp and fire it up in one go, without testing to see if the PSU is operating properly...)
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Old 19th January 2013, 09:24 PM   #1102
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While we're on the subject,

I have 2x30v 750va plitron. According to calculations, that shoud give me +- 40V rails. Is that too high or should I target 32V which gives 2 x 24v?

Last edited by necplusultra; 19th January 2013 at 09:28 PM.
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Old 19th January 2013, 09:36 PM   #1103
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Hi necplusultra
When I chose my transformer simply followed the instructions in the First Watt F5 turbo doc that Mr Pass has kindly shared, link http://www.firstwatt.com/pdf/art_f5_turbo.pdf

My 300va one maybe a little underpowered but I'm not too worried as I have sensitive 95db speakers
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Old 19th January 2013, 09:38 PM   #1104
6L6 is offline 6L6  United States
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You will have to cascode the front end. (I.E., the v3)

You will have to use 50v caps.

You will need to watch the total dissipation of the outputs and bias accordingly.

There is nothing insurmountable about it, depending on which version you are planning.

But it's always less headache to buy and use the proper transformer.
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Old 20th January 2013, 12:41 AM   #1105
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Thanks 6L6

I may try to tweek with your recommendation for 40v configuration somewhat but I'll be safe and buy the reccomended tfo.

I'm using 2 x 18v 300 VA for standard F5 which was implicitly recomended in the F5 article.

Are there any published reccomendations for F5T V1 V2 , V3?

From the F5T article, it states 32 V rails for V1 and V2 but I did not see any mention of V3 reccomendations nor the tfo VA rating.

regards.

Last edited by necplusultra; 20th January 2013 at 12:44 AM.
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Old 20th January 2013, 12:47 AM   #1106
6L6 is offline 6L6  United States
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The rule of thumb is 6 times the 8-ohm power output of the amplifier equals transformer VA.

For instance, the F5T v2 is 50wpc x2

The whole amp is 100 watt power output.

100 x 6 = 600VA minimum
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Old 20th January 2013, 01:14 AM   #1107
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and hence the 300va rating for f5: 6x2x25wpc

thanks 6L6

Learning so much from pass amp building.
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Old 20th January 2013, 01:26 AM   #1108
6L6 is offline 6L6  United States
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This is DIY -- we are all learning, and nobody knows it all.

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Old 20th January 2013, 11:02 AM   #1109
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I've just spotted this kit on E-Bay, it might help a few prospective builders out.

2 X DELUXE F5 FET & MOSFET CURRENT FEEDBACK AUDIO POWER AMPLIFIER KIT! | eBay
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Old 20th January 2013, 11:25 AM   #1110
sangram is offline sangram  India
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That's a rip-off the original F5, not the Turbo...
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