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Old 12th January 2011, 02:02 AM   #1
rknize is offline rknize  United States
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Default More Antek Iron

Has anyone noticed that Antek has added a few new items sometime recently? They have a 360V version with 70V taps now as well as another that seems to have a bit more 6.3VAC capacity. I can't remember what the specs were before, but I think the old one is now the AS-* and the new ones are AN-*. Hard to tell because the link to the PDF is broken on the AS models.

The AN-4TK360 should be very well-suited to a souped up Millett DCPP amp, I'd imagine. I bought the AN-4TK400 for it and it's a bit much without more extensive mods than some might want.

There a bunch of other new ones too and a few new voltages that I don't remember from before.

Last edited by rknize; 12th January 2011 at 02:07 AM.
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Old 12th January 2011, 12:52 PM   #2
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but I think the old one is now the AS-* and the new ones are AN-*. Hard to tell because the link to the PDF is broken on the AS models.
I read somewhere that the AS versions are the same as the equivalent AN version except that there is a shield between the primary and secondary to reduce the noise coupling that is inherent is toroids.
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Old 12th January 2011, 02:57 PM   #3
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Originally Posted by tubelab.com View Post
......that is inherent is toroids.
and in c-cores, and in EI cores... because it is a capacitive phenomenon, not an inductive one.
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Old 21st January 2011, 03:06 AM   #4
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Originally Posted by rknize View Post
I bought the AN-4TK400 for it and it's a bit much without more extensive mods than some might want.
Russ,

How much voltage do you get out of the AN4TK400 at, say, 200 mA load and 120 V in?

I'm considering getting one for a project but would prefer to see some solid data before deciding on a transformer to get.

Thanks,

~Tom
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Old 21st January 2011, 02:42 PM   #5
Matt BH is offline Matt BH  United Kingdom
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I have a pair of Antek AN-4T360 which gives me a nice 500V or so either full bridge (both secondarys in parallel) or 506V with the usual CT type arangement and two diodes, both loaded at 600mA. This is plain capacitor input using 2 x 1000uF 400V Evox Rifa PEH169s in series with 220K droppers accross them. Of course this is way more load than you would use but I thought I would play. I used household incandescent bulbs as a load.

With the 4TK400 I think you would get somewhere around 560V or so with solid state rectifiers and capacitor input. You could lower it with vacuum rectifiers or CRC. Choke input would give you somewhere around 360V out.

Cheers Matt.
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Old 21st January 2011, 02:55 PM   #6
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I wired a 4T400 up to a Simple SE. There is no 5 volt winding and I think a Chinese 5AR4 would explode under these conditions so I used the SS diodes. I got 545 volts which made the KT88's rather hot and bothered. I also had the stock Panasonic 500 volt caps in the board so I didn't leave it on long. I decided that the 4T400 was too much for the Simple SE.

I have some 4TK400's and I had one hooked to the red board early last year. If I remember right I got about 550 volts. I am now using two of the $15 transformers for 630 volts unloaded and 600 volts with both channels cranking out 100 watts each. In this case more IS better.
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Old 21st January 2011, 04:18 PM   #7
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That doesn't quite jive with what I got on the red board with the AN4TK400, but I was using the stock, on-board FW rectifier and ripple filter. I may need to tweak the divider on the ripple filter a tad. I got 475V of B+ under load.

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Old 21st January 2011, 06:00 PM   #8
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I need some toroid, preferably shielded, with shield between primary and secondaries, for microphone preamps. It should be something 300 VA, with 300V rectified (or may be more), 50-70V 150 mA for phantom, and pair of 6-8V secondaries, 4-6A.

What would you recommend?
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Old 21st January 2011, 06:03 PM   #9
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Originally Posted by rknize View Post
That doesn't quite jive with what I got on the red board with the AN4TK400, but I was using the stock, on-board FW rectifier and ripple filter. I may need to tweak the divider on the ripple filter a tad. I got 475V of B+ under load.
Makes sense. The ripple filter has a voltage divider in it. Granted, 47k/1M doesn't shave much off the voltage, but math says:

1M/(47k+1M) = 0.955

475 * 1/0.955 = 497 V

So you should see 500-ish volt across the reservoir cap. 1.25 * 400... That's in line with what I'd expect. 550 V sounds high. But only by 10 %.

~Tom

Last edited by tomchr; 21st January 2011 at 06:05 PM.
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Old 21st January 2011, 06:28 PM   #10
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I may need to tweak the divider on the ripple filter a tad. I got 475V of B+ under load.
I found that more capacitance across the rectifier output gets the voltage up. My line voltage is 122 volts.

I am running the output tubes on my red board directly off of the rectifier ahead of the ripple filter. This way the mosfet runs cool.

Initial experiments with Antek and red board made the mosfet and the dropping resistor unhappy, so I ran the entire board off of a 2T230 (I had one) which runs the board at about 280 volts DC after the mosfet. I used the 4T400 for the raw plate supply only and I used a big cap (2 X 470 uF in series).

It would be possible to run a red board with all Antek transformers, but I would use something like a 1T230 or 1T250 to supply the B+ for the board. An AN-0525 (series FWB) or AN-0540 (FWCT) could be used for the bias supply. The big Antek of your choice could be used for the output tube plate supply and heaters. Depending on my choice of output tubes it could be anything from a 4T360 to a 4T500.

I wanted more power and I found the cheap power transformers on Ebay so I modified my set up. One $15 transformer runs the entire red board using the on board rectifiers (with 2 more diodes added for a FWB) mosfets filter and bias supply. An off board 470 uF 450 V cap is used across the bridge output. The second $15 transformer with its own bridge and cap generates a second 300 volt supply that is wired in series with the main supply for 600 volts of B+.
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