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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 28th February 2017, 01:07 PM   #71
henryve is offline henryve  South Africa
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I still can't understand how UPS can justify a shipping cost of $367 US for 2 @ 200VA transformers.
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Old 28th February 2017, 01:32 PM   #72
6L6 is offline 6L6  United States
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Sony Vfet Illustrated build guide
Because it's UPS. I contracted for them a few years ago, I have little good to say about the company as a whole. I avoid using them as much as possible.

But really what you're looking at is their price reflect that they don't want to do it... All the other carrier's options are reasonably priced, so UPS' price has been effective in dissuading you from using them.

Last edited by 6L6; 28th February 2017 at 01:37 PM.
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Old 28th February 2017, 01:47 PM   #73
henryve is offline henryve  South Africa
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Jim

Those Antek AS series transformers: are they bifilar wound transformers with uniformly laid down windings?

I never had one in my hands, so I can't tell. I have one Amplimo 650VA transformer that is winded like that, and I would go for an Amplimo again if the Anteks were not substantially cheaper. It's $137 vs €165 shipped (by slow boat).
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Old 28th February 2017, 01:56 PM   #74
6L6 is offline 6L6  United States
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Sony Vfet Illustrated build guide
Quote:
Originally Posted by henryve View Post
Those Antek AS series transformers: are they bifilar wound transformers with uniformly laid down windings?
No idea, they are taped pretty tight, and I've never opened one up.

I like the AS- because the shield needs to be tightly wound around the windings, and then taped tightly to stay on. This means that the Shielded ones have, in my experience, less mechanical hum than the AN- .
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Old 28th February 2017, 05:38 PM   #75
Rolle is offline Rolle  Denmark
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Default small white TO-3 insulators

Hi Jim

Thanks alot for the build guide - it has really been a great help to me. I have now managed to bias up the front end Mossfets and adjusted the DC offset (G - T18). The amplifier has been running stable for a couple of hours now.

I am now about to install the VFETS but have one doubt. The VFET essential package from diyaudiostore only contained 8 PC's of the small white insulaters - I noticed that even the picture from when I ordered the essential kit also only show 8 pcs. In your build guide it seems 16 pcs are needed (4 insulators per VFET). Can I get along with only 8 insulators or do I need to order additional insulators?

Thanks again - your help is really appreciated

Best Regards
Rolle
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Old 28th February 2017, 05:48 PM   #76
6L6 is offline 6L6  United States
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Sony Vfet Illustrated build guide
I didn't build mine from the Kit...

With only 8, I'd use the spacers on the holes with the screws to help align everything.

The pins could be insulated with a bit of wire insulation from stripped ends, small bits of heat shrink, teflon tubing, or something similar. If everything is lined up properly the pins shouldn't touch the metal holes of the T-bar, but having something on the pins would be good insurance.
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Old 1st March 2017, 09:23 AM   #77
henryve is offline henryve  South Africa
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Is there any benefit in matching Q5 and 6?

I have some 2SK2013 and 2SJ313 FETs in my stash that I can use in place of the supplied Fairchilds.
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Old 1st March 2017, 10:02 AM   #78
Fabian85 is offline Fabian85  Germany
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Quote:
Originally Posted by henryve View Post
Is there any benefit in matching Q5 and 6?

I have some 2SK2013 and 2SJ313 FETs in my stash that I can use in place of the supplied Fairchilds.
Not really. Use the Toshibas, no matching is needed as far as I remember.
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Old 1st March 2017, 01:40 PM   #79
Marra is offline Marra  United Kingdom
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Sony Vfet Illustrated build guide
These work well and allow you to space the board slightly from the bracket.

164004003 UNBRANDED, Spacer, Round, Nylon 6.6, 6x4.5mm | Farnell element14
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Old 1st March 2017, 02:04 PM   #80
Zen Mod is offline Zen Mod  Serbia
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Sony Vfet Illustrated build guide
better to have pcb on bracket , you need outputs tightened
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