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Author Topic: Tony's 6H32 pre-amp  (Read 3240 times)

Offline tony

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Tony's 6H32 pre-amp
« on: March 03, 2011, 12:55:16 PM »
Hi All,


I was encouraged by this tube when I swapped those with the stock tubes in my Sakua-AV200 hybrid amp, so now i decided to build a preamp out of it. configuration is cascaded common cathode-common anode using one bottle per channel....

I borrowed an Alexan HC961 plastic casing from my son to house this preamp, i then proceeded to cut out holes for the tube sockets and other parts and started mounting them....







after assembling the power supply, I checked the raw dc voltage, the power traffo i built was intended for another project, but a lightbulb flashed in my head yesterday and off i go to building this amp...



I decided on a plate load of 4.7k, I felt that it was just about right for the B+ available:


looking at the curves, at a plate of about 40 volts, grid bias needed is about 0.56 volts, now a silicon diode like a 1N4007 surely fits the bill.... so then consruction can be completed.

more pics,





completed amp:


this is the schematic of the completed amp:


I would like to mention that the power supply uses a common mode choke to filter both sides of the plus and minus sides of the psu isolating the from end of the psu stage to the rest of the amp.

set-up and listening test:


I put aside my 7N7 pre-amp and hooked up this pre-amp:






so how was the sound?

like always, i liked the "hotel california" on this pre-amp, i can hear the bass guitar and kick drums, not so loud but distinct.......like the other amps i built, this amp is very quiet, no hum, no hiss no extra noise inspite of its being housed in a platic case.....

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Tony's 6H32 pre-amp
« on: March 03, 2011, 12:55:16 PM »

Offline NORTH LUZON

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Re: Tony's 6H32 pre-amp
« Reply #1 on: March 03, 2011, 12:59:48 PM »
swabe ah
pogi point master tony
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Re: Tony's 6H32 pre-amp
« Reply #1 on: March 03, 2011, 12:59:48 PM »

Offline tony

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Re: Tony's 6H32 pre-amp
« Reply #2 on: March 03, 2011, 01:06:07 PM »
 ;) thanks......
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Re: Tony's 6H32 pre-amp
« Reply #2 on: March 03, 2011, 01:06:07 PM »

Offline ???

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Re: Tony's 6H32 pre-amp
« Reply #3 on: March 03, 2011, 01:10:16 PM »
Tubes meets LCD.  Pogi point sir tony.
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Re: Tony's 6H32 pre-amp
« Reply #3 on: March 03, 2011, 01:10:16 PM »

Offline Mhavskie

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Re: Tony's 6H32 pre-amp
« Reply #4 on: March 03, 2011, 01:44:56 PM »
Quote from: JS on March 03, 2011, 01:10:16 PM
Tubes meets LCD.  Pogi point sir tony.
Tubes meets plastic case, galing ;D
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Re: Tony's 6H32 pre-amp
« Reply #4 on: March 03, 2011, 01:44:56 PM »

Offline Ikasamoko

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Re: Tony's 6H32 pre-amp
« Reply #5 on: March 03, 2011, 02:40:07 PM »
I really "hate" this guy pag nag post....

palaging tumutulo laway ko sa mga project mo...:P

ang linis at well organized na assembly from wiring to enclosure....dem!!


ganda point sa'yo sis....
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Offline tony

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Re: Tony's 6H32 pre-amp
« Reply #6 on: March 03, 2011, 03:37:29 PM »
Quote from: Kasamiko on March 03, 2011, 02:40:07 PM
I really "hate" this guy pag nag post....

palaging tumutulo laway ko sa mga project mo...:P

ang linis at well organized na assembly from wiring to enclosure....dem!!


ganda point sa'yo sis....


thanks, i am posting this so as to inspire members to carry on with this tube tradition, sayang kung makalimutan ng kabataan at mawala......
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Offline Ikasamoko

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Re: Tony's 6H32 pre-amp
« Reply #7 on: March 03, 2011, 03:47:01 PM »
if pwede lang sana makabili nyan just like resistors and/or soldering lead...there's no reason na di ako sasabak dyan..:(

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Offline Triple_D

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Re: Tony's 6H32 pre-amp
« Reply #8 on: March 03, 2011, 03:53:06 PM »
ok itong audio ni master tony ganda siguro ng tunog nito....
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Offline RaffT

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Re: Tony's 6H32 pre-amp
« Reply #9 on: March 03, 2011, 06:51:23 PM »
ako hanggang 12AX7 preamp palang nagawa ko(para sa guitar FX)...

sir tony, bka pwede mo rin magawan ng kit ito? good for 1st time DIYers.. ilang watts RMS siya ?
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Offline tony

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Re: Tony's 6H32 pre-amp
« Reply #10 on: March 03, 2011, 07:40:38 PM »
Quote from: RaffT on March 03, 2011, 06:51:23 PM
ako hanggang 12AX7 preamp palang nagawa ko(para sa guitar FX)...

sir tony, bka pwede mo rin magawan ng kit ito? good for 1st time DIYers.. ilang watts RMS siya ?

pwede, pero preamp lang ito, kailangan pa rin ng power amp....pwedeng i partner ito kahit sa solidstate power amps...
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Offline Ikasamoko

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Re: Tony's 6H32 pre-amp
« Reply #11 on: March 04, 2011, 11:08:20 AM »
mga magkano kaya yan mabuo? yung mga hard to get na parts lang...tube, socket at yung mga quality type na caps...
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Offline tony

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Re: Tony's 6H32 pre-amp
« Reply #12 on: March 04, 2011, 12:06:46 PM »
Quote from: Kasamiko on March 04, 2011, 11:08:20 AM
mga magkano kaya yan mabuo? yung mga hard to get na parts lang...tube, socket at yung mga quality type na caps...

yung 6N23 double triode, equivalent sa 6922, meron sa silver strings for 500, sockets sa watson's 35, pero sa silver strings nasa 250 ang isa, katulad nung nasa amp....

kung gagamit ka ng designer caps...mas mataas aabutin...

yung transformer, design ko, mga 1000......

total a little over 3000....
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Offline Ikasamoko

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Re: Tony's 6H32 pre-amp
« Reply #13 on: March 04, 2011, 12:16:35 PM »
3000 sa preamp pa lang sis Tony??
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Offline tony

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Re: Tony's 6H32 pre-amp
« Reply #14 on: March 04, 2011, 12:26:37 PM »
yes.....
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Offline Ikasamoko

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Re: Tony's 6H32 pre-amp
« Reply #15 on: March 04, 2011, 12:31:45 PM »
ouch....kunting dagdag na lang Sakura main amp na...:D

but this will be useless without a good amplifier and a good pair of speakers....

another 20k i think...:(
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Offline ???

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Re: Tony's 6H32 pre-amp
« Reply #16 on: March 04, 2011, 12:37:24 PM »
Up    40K.....
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Offline Mhavskie

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Re: Tony's 6H32 pre-amp
« Reply #17 on: March 04, 2011, 12:46:49 PM »
may mga company pa ba na gumagawa ng vacuum tubes, o mga old stock na din ang mga tube na yan? ;D
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Offline ???

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Re: Tony's 6H32 pre-amp
« Reply #18 on: March 04, 2011, 12:50:53 PM »
Alam ko meron pa, gawa ng mga tube enthusiast.
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Offline tony

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Re: Tony's 6H32 pre-amp
« Reply #19 on: March 04, 2011, 03:28:58 PM »
Quote from: Mhavskie on March 04, 2011, 12:46:49 PM
may mga company pa ba na gumagawa ng vacuum tubes, o mga old stock na din ang mga tube na yan? ;D

yung 6H23 gawang russia, marami pa, saka hindi mawawala yung ibang tubes sa production dahil sa mga guitar players na mahilig sa tubes...
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Re: Tony's 6H32 pre-amp
« Reply #19 on: March 04, 2011, 03:28:58 PM »
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