Tube Amplifier Lovers ? ... lets DIY !

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mnd_43
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Tube Amplifier Lovers ? ... lets DIY !

#1 Post by mnd_43 » Tue Dec 23, 2008 4:42 pm

Here r some pic of my diy tube amplifier
matching with NAD C521 CD player n a pair of JAMO classic 4
... EL84 pushpull with 6AN8 pre-amp
using pioneer casing found in the recycle-bin n totaly new wiring n circuit design
only 10watts power output but can drive JAMO classic 4 with more than 100watts
efficiently ...
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Last edited by mnd_43 on Fri Dec 26, 2008 9:48 am, edited 1 time in total.
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Re: Tube Amplifier Lovers ? ... diy!

#2 Post by gpssin » Tue Dec 23, 2008 8:03 pm

Hi bro,

your post bring back 40 yrs ago memories of mine. At that time I also DIY those Tube Amp.

Are you living in Singapore? Where do you get the parts and schematic for theTube Amp ?

Are you willing to share your knowledge with me as I am keen to assemble my own set too.

Thanks.
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Re: Tube Amplifier Lovers ? ... diy!

#3 Post by Redstorm » Tue Dec 23, 2008 8:10 pm

Yes, me too. In the 60s, as a kid, I used to see my ex-neighbour assembling his own tube amplifier. I was too young then to understand that this amplifier could produce warm sound; better than integrated amps. The only thing I knew then was that it was ugly looking. :mrgreen:
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Re: Tube Amplifier Lovers ? ... diy!

#4 Post by mnd_43 » Tue Dec 23, 2008 8:18 pm

I m in Malaysia

Why not ... at the beginning l know 0 about tube amp
by self study n research n surfing internet l manage to build my
amp. Most of the circuit l built is by following from few sample basic circuit that can be found
easily in the net .

parts ? singapore / KL ...
Last edited by mnd_43 on Sat Dec 27, 2008 4:37 am, edited 1 time in total.
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Re: Tube Amplifier Lovers ? ... diy!

#5 Post by moeyHC » Tue Dec 23, 2008 8:59 pm

I have a heavily modified Parallel Single Ended 300B/6SN7GTB/12AT81-ECC81 integrated pushing out 18 watts RMS per channel. Most of the ECaps I used are Elna Stargate/Silmic, Rubycon Blackgate (Bias/filtering), and Jensen Copper Paper in Oil for signals.

Tube amps are easy to build and give reasonable performance even in inexperience hands. The nature of tube amp are sweet, mellow, warm & most of all transparent. You need a good pair of speaker with high sensitivities to match. The good ones are hard to come by. I have a pair of 89db Ensemble PA1 Silver. A good AC power supply is a must for these amps and I have build an isolation transformer with EMI/RFI filters and a capacitor bank at the output for that extra push. Due to their relatively low power, listening to big piece music can be a challenge. Interconnects matching too can cost a bomb.... just don't let your BH knows how much are the wires... But, a well tuned system will give years of enjoyment.

A good place in Singapore to buy DIY parts is ground floor at Berlington Square (next to Sim Lim Sq - N1 18.152 E103 51.155 ). There are two shops namely Martin - :D & Wells Audio - Frankie (both shops are on the same aisle- Gnd Floor). In KL a good source is Octave Electronics In PJ ( http://www.octave-electronics.com/ ) and DIY Paradise (http://diyparadise.com/web/ - Mr Yeoh). Anyone in Penang interested we can meet to exchange notes...

WEB Sites with more information :-

http://www.tnt-audio.com/int.html - A wealth of information here for DIYers.
http://www.angela.com/ - On line HIFI part stores
http://www.drtube.com/audioamp.htm - Lots of tube amp circuit to choose from


Just a note of cautions :- Tube Amp contains Lethal/High Voltages. Most run at >800 Vdc that can KILL instantly.....
:thumbsdown:
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Re: Tube Amplifier Lovers ? ... diy!

#6 Post by mnd_43 » Tue Dec 23, 2008 10:34 pm

tq bro for the info ... !

this hobby is easy but not cheap ... every lovers knows it !
eRRR ... how much does u spent in rm ? > 100k ?
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Re: Tube Amplifier Lovers ? ... diy!

#7 Post by moeyHC » Wed Dec 24, 2008 10:12 am

It is the joy of building and enjoying the fruits of your creation that matter. It is definitely more expensive to DIY than buy a China set. Well, I rather not think about the amount I spend on this very expensive hobby... just too painful to recall.... #-o

If you think the hardware is expensive than you should be aware that the software is equally outrageous. In Malaysia it typically cost:-

- XRCD/2/24 ~RM120-140/cd
- LPCD ~RM130/cd
- Audiophile/SA ~RM80-120/cd
- Others ~RM40-80/cd

I bought some in HK for about 30% less.

What brand of tubes are you using for the EL84 it looks like EI? Have you tried other brands... each of them sounded differently and a good match between the pre and power is hard to achieve. I notice that your amp is place on a sub-woofer, does this affect the sound? Tube amp are very sensitive to vibration and we frantically isolate them from the source.

Merry Christmas!... cheers.
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Re: Tube Amplifier Lovers ? ... diy!

#8 Post by mnd_43 » Wed Dec 24, 2008 4:23 pm

l m using GTEL84S ( Groove tubes ) n cheapo Hitachi 6AN8
... dont worry about the sub ! ... passive coz no speakers installed !!

here some more pic n the passive hand made pre-amp ... not afford
to get a good attenuator - just simple 250K LOG.

take a look at the inter-connect ... just get a good stereo microphone cable
n diy ! ... not bad ughhh !

n the components too ... cheapo things !
n the output transfomers are both hand re-wired ... found faulty from a recycle-bin !
..... n the result are much more warmer n transparent compare to any standard home hi fi !
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Re: Tube Amplifier Lovers ? ... diy!

#9 Post by rickoes » Thu Dec 25, 2008 10:27 pm

hi
If you need cd transport here the link for cheap and good DIY transport.
http://www.diyaudio.com/forums/showthre ... genumber=1

I just managed to power up and running for 20 hours, I can say that this transport beat my Teac P700. Further more I haven't upgrade the cap and clock according to guru from DIYAUDIO.
:thumbsup:

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Re: Tube Amplifier Lovers ? ... lets DIY !

#10 Post by moeyHC » Fri Dec 26, 2008 11:33 am

Thanks for sharing. A good CD transport can make a big different to your sound system. Fine tuning a CD player can be tricky without the necessary equipment and most DIYers depend on their ears to do it. For me, I chose to buy a reasonable system to upgrade its components.

My Kenwood Top loading LD1 is a vintage system with a solid chassis and an overkilled drive motor. The only thing I have not done is to re-clock it. I feel that high speed circuitry needs very precise control impedance of the clocks signals and most re-clock PCB I have encountered are far from satisfactory (my personal opinion). Even if the built is great the twisted pair clock signal wire to the preprocessor defeat the very basis of having the re-clock. Maybe I have to lower my receptions of the re-clock and give it a try.... :-? .. cheers!
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