• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

HQ-DHT (All tube DHT amli) 26-45-2A3

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quanghao

quanghao

Member
Joined 2009
quanghao.com/
Salas shunt (SSHV) for HQ-DHT amli

Hi all!
This image I was measure V-in and v-out SSHV for my amli.
My amli need 330V and 89 mA. I fix SSHV 110mA at 330v- Vout, V-in at 340V.
Use Mje 350!
You can see int the image!
 

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suwaned

suwaned

Member
Joined 2011
Hi,
I have made ​​Cleo 4.0 triodedick's preamp with tubes and D3A B406,
to run a power like that you created. (new planned and was gathering parts for it)
oh thank you for your information, I've ordered with Rod Coleman to supply filaments.
and I have difficulty in making the preamp Cleo 4.0 and I'm posting http://www.diyaudio.com/forums/tubes-valves/192774-tube-b-406-triode-dicks-cleo-4-a.html
how do you think the preamp cleo4.0. to drive the amp "amli"?
thank you
 
andyjevans

andyjevans

Member
Joined 2003
artsandmedia.com
Here is a rough schematic of my current amp - just tweaking it so values may change a little. Uses 26 > 46 > 300B. 10 watt resistor on 26 cathode needs to be the best wirewound and 40 to 50 watts. Very clean and clear - lots of low level detail. Comments most welcome!! Andy
 

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andyjevans

andyjevans

Member
Joined 2003
artsandmedia.com
Here's a slightly clearer version. The grid stoppers should probably be less than 1K. Note there are two 156C Hammond plate chokes in series, wired out of phase. Both the 10 ohm cathode resistor and the negative side of the filament supply on the 26 go to ground. This is filament bias, for those unfamiliar with it. It needs a very clean supply, hence the choke input which is 280mH. The Lundahl LL1692A can be swapped for the much cheaper Hammond 126C with very good results. This makes the amp good value to build. The O-netics OPTs are level 1, and are strongly recommended over other alternatives. Again, good value. All the 47uF caps should be polypropylene, not electrolytics - motor run caps are a good value option.

Andy
 

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suwaned

suwaned

Member
Joined 2011
Thank you Quang hao , I'm trying to made like your scheme, this voice is amazing.
I have yet to encounter a hum.

Coleman thanks, I use your the filament supply for 26.( transformator Parmeko 6,3volt 5A)for others not yet because i have not transformator

Audio Bella thanks for support. (Vicor DC to DC and parts) Bella-Audio

This is still experimental but at the trial: this voice complete
 

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Rod Coleman

Rod Coleman

Member
Joined 2004
Hi Edy, Good to hear that the 26 Filament Regulator kits work well - thanks for letting us know!

The dc - dc filament heater for 45 and 300B will be quiet, but it will give no barrier to high-frequency noise from the mains. Also, the dc - dc output will have a cheap electrolytic inside.... and since the 45 filament is also the cathode, the music signal will be forced into the electrolytic by the filament dc voltage - and your amp will be improved when you use all of your regulator kits.

Many other good dc solutions can be greatly improved for Sound Quality, even if you have no hum!

www.audiofaidate.org • View topic - water babies: un line driver DHT e xover passivo
 
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