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Old 28th October 2011, 02:26 AM   #621
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Quote:
Originally Posted by Wwan View Post
How is it going Do? Manage to settle it?
I was just fooling around with those tubes... I don't have much interest right now since I'm using Full Music 12AX7. I was just curious to know how the 6922 would have sounded.

Do
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Old 28th October 2011, 09:20 AM   #622
Wwan is offline Wwan  Malaysia
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Alrite. My 6922 is on the way flying to me although the kit is long way to go. Cheers.

Alfred.
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Old 28th October 2011, 09:40 AM   #623
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by pinnocchio View Post
I was just fooling around with those tubes... I don't have much interest right now since I'm using Full Music 12AX7. I was just curious to know how the 6922 would have sounded.

Do
Where did you buy your Full Music Tubes from? they are for sale on ebay, is it safe to buy them from ebay?
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Old 28th October 2011, 10:47 PM   #624
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Originally Posted by DQ828 View Post
Where did you buy your Full Music Tubes from? they are for sale on ebay, is it safe to buy them from ebay?
It is usually ok to buy from Ebay. I do all the time. You need to check the seller's rating... Usually over 100+ sales with 99% feedback is good. For tubes though, I would go with sellers that specializes and have over 1000 sales with more than 98.5% of feedback...

I bought my tubes from Parts ConneXion - The authority on hi-fi DIY parts and components

Thanks
Do
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Old 29th October 2011, 11:27 AM   #625
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Hello,
I connected without valves and ... voila.
It seems to work. Some measurements to see if it is correct with a 150V secondary transformer:

- Vout pcb tube-i-Zator no load is 211V.
- Vout pcb tube-i-Zator with load ranges SSHV is 164v but varies a little.

- Vout SSHV (connected no load) 150V although it takes 30-40 minutes to reach this voltage. Start with 138V

The IRF840 MOSFET reaches 80 degrees C (70C heatsinks). Ambient temperature 25C

Is correct?, is it normal temperature so IRF840?, I put the heatsink on the list of materials.

regards
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Old 29th October 2011, 12:50 PM   #626
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I correct, it takes 15-18 minutes to reach 150V.

While the IRF840 I pushed against the sink. The difference is 10 degrees between heatsink and mosfet. I have used Mica and thermal grease. I've always been successful.

I have to put a larger heatsink or well those 80 degrees C?
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Old 29th October 2011, 02:38 PM   #627
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Originally Posted by albertob View Post
I correct, it takes 15-18 minutes to reach 150V.

While the IRF840 I pushed against the sink. The difference is 10 degrees between heatsink and mosfet. I have used Mica and thermal grease. I've always been successful.

I have to put a larger heatsink or well those 80 degrees C?
Just check the spec on IRF840 for max temp and junction point max temp. I believe the max temp for junction point is 150C

Ciao!
Do
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Old 29th October 2011, 08:30 PM   #628
Wwan is offline Wwan  Malaysia
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Hi Albertob,

What device you use to test the temperature.

Thanks.
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Old 29th October 2011, 09:33 PM   #629
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Originally Posted by Wwan View Post
Hi Albertob,

What device you use to test the temperature.

Thanks.
I used a multimeter that can measure the temperature with a probe. Like this:

MULTIMETRO 3 1/2 DIGITOS TEMPERATURA CAPACIMETRO FRECUENCIMETRO | BRIELCO ARTICULOS DE ELECTRONICA Y COMPONENTES ELECTRONICOS
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Old 30th October 2011, 03:51 PM   #630
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Quote:
Originally Posted by albertob View Post
I correct, it takes 15-18 minutes to reach 150V.

While the IRF840 I pushed against the sink. The difference is 10 degrees between heatsink and mosfet. I have used Mica and thermal grease. I've always been successful.

I have to put a larger heatsink or well those 80 degrees C?
I've been running mine for some time now at this temperature and it is quite fine. It will most probably shorten its life span but...

Ciao!
Do
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