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Old 16th January 2012, 02:53 AM   #11
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Quote:
Originally Posted by reo View Post
hi
follow up from my last post
i have it up running i have adjusted the heater to 6.3V and high voltage 75V for the included tube .
So all is well and working fine .
regards
rol
how does it sound and perform? are you pleased?
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Old 16th January 2012, 07:59 PM   #12
reo is offline reo  Canada
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i piggybacked the pre to my meanwell at 27V that also feeds my 2050's and naturally from there it all went well . there is more volume output (compared to the MK3),i heard white noise from my speakers, either at high or low volume, must be due to noisy tube,kindea resolved this by touching the 2 heatsinks with finger, and later by mistake i pronged the 2 heatsinks together with schrew driver and blew something up or down the line so that was the end of trial test . i might get another one , we shall see later
regards
rol

Last edited by reo; 16th January 2012 at 08:01 PM.
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Old 20th January 2012, 01:35 AM   #13
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Hi there Reo,

That was indeed not a good idea, the heat sink of the Mosfet is not supposed to be grounded.

I can send you a new Mosfet to replace the old one, just undo the nut and bend it forward, then heat it up high and let it fall out.

I might insulate the Mosfet from now on to prevent it from happening.

please drop me a mail at Arjen@helderhifi.com for details.
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Old 20th January 2012, 03:26 PM   #14
Katch is offline Katch  United Kingdom
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Would this preamp run off the 12v 3.5 amp PSU that Arjen sells with his TA2020 kits or would it need a beefier supply?
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Old 20th January 2012, 03:51 PM   #15
reo is offline reo  Canada
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beefier would be better but no harm in trying if the 12V 3.5A is suitable .
Then again he propably mentions it works with the 12V meanwell that are adjustable from 11 to 14V.....14V which seems to be the minimum Voltage required ....but then again only 6.3V is required to adjust the heaters for the included tube and the high voltage trimpot to be adjusted at 60 to 70V
regards
rol
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Old 21st April 2012, 11:53 AM   #16
manud is offline manud  India
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Hi , I received the following from arjen helder - 1. MKIII Tripath TA2020 PCB with power supply (11-14 volts ADJ @ 3.5 Amps) 2. MKIV Universal Pre-amp . I did not got another power supply for the pre-amp . I understand may be the above power supply will work with the pre-amp too but could I piggyback the pre-amp on the power supply along with the amp or should I get a separate power supply ? If not this power supply, what would be the most appropriate power supply for me to get ? I am not able to go ahead
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Old 25th April 2012, 10:16 PM   #17
reo is offline reo  Canada
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The MK1V has a mention that it requires a 14 to 24V.
So you can hook up the MKIII and the mK1V together, but you might not get optimum power . if your speakers require more energy then get a separate power supply for the MK1V.
regards
reo
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Old 26th April 2012, 05:29 AM   #18
JZatopa is offline JZatopa  United States
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How would this fair in a car environment with 13.7V and as many amps as you want to use? I am about to try building a JLH amp for my car and this might be an interesting front end for the amplifier.
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Old 27th April 2012, 10:56 AM   #19
manud is offline manud  India
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Thanks Reo . I found the pre-amp pdf also at http://www.data.helderhifi.com/Pre-a...prnt%20%20.pdf It mentions 1A peak ( cold tube inrush current ) and 400mA Max at 14V 250mA at 30V.
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Old 15th May 2012, 05:41 AM   #20
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Default Another option.

Hi, Just seen this thread and there is another option you could consider that I currently to run my Tripath amps. That is a TemaadAudio mini valve Pre, this little unit uses 2 x microphone 6C6B valves. It also has 3 inputs and it gives the Tripath much more needed power and authority.
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