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Author Topic: diy & other tube-related bargain find*  (Read 58279 times)

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Offline ATJr.

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Re: 12au7 substitutes
« Reply #60 on: Jul 21, 2006 at 06:02 PM »
hey oweidah,

can i interest you in a stereo line preamp, ala-FOREPLAY, but this time single 12au7 tube! ;D

uses cheap parts, 2 x 750mA 110/220 pri, 12volt secondary @P105 each, golden mars, 2 x IRF820 mosfet as source follower @P35 each from newport or oriental, jojo's favorite chassis,

what do you say? ;D
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Offline oweidah

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Re: 12au7 substitutes
« Reply #61 on: Jul 21, 2006 at 06:18 PM »
Quote from: 2ny on Jul 21, 2006 at 06:02 PM
hey oweidah,

can i interest you in a stereo line preamp, ala-FOREPLAY, but this time single 12au7 tube! ;D

uses cheap parts, 2 x 750mA 110/220 pri, 12volt secondary @P105 each, golden mars, 2 x IRF820 mosfet as source follower @P35 each from newport or oriental, jojo's favorite chassis,

what do you say? ;D

wow!!! thanxalot for your offer sir 2ny but i'm quite contented with what i got now. maybe other members here who wanna get a taste of valve preamplification will read your post and be interested!

cheers!!!  :)  :)  :)

ps.....sir enjoy your vacation, quality time with family but sure bitin pa yan....laging ganyan parang kahapon lang kadarating mo lang bukas nag-eempake ka na naman :)
« Last Edit: Jul 21, 2006 at 07:13 PM by oweidah »
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Offline markmlists

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Re: 12au7 substitutes
« Reply #62 on: Jul 21, 2006 at 07:19 PM »
Quote from: 2ny on Jul 21, 2006 at 06:02 PM
hey oweidah,

can i interest you in a stereo line preamp, ala-FOREPLAY, but this time single 12au7 tube! ;D

uses cheap parts, 2 x 750mA 110/220 pri, 12volt secondary @P105 each, golden mars, 2 x IRF820 mosfet as source follower @P35 each from newport or oriental, jojo's favorite chassis,

what do you say? ;D


Ayos ito ah. Anong topology ito sir tony, anode follower? maximized gamit ng tubo nito. :)
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Offline ATJr.

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Re: 12au7 substitutes
« Reply #63 on: Jul 21, 2006 at 07:56 PM »
Quote from: markmlists on Jul 21, 2006 at 07:19 PM

Ayos ito ah. Anong topology ito sir tony, anode follower? maximized gamit ng tubo nito. :)

those familiar with Foreplay's topology will understand what i mean. only this time the cathode follower is replaced with a mosfet source follower.

for B+ the 2nd traffo will be wired back to back and the 220volt ct used as a full wave rectifier, uf4003 is useful here, for a B+ of around 150volts which is ample.
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Offline markmlists

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Re: 12au7 substitutes
« Reply #64 on: Jul 21, 2006 at 08:18 PM »
Quote from: 2ny on Jul 21, 2006 at 07:56 PM
those familiar with Foreplay's topology will understand what i mean. only this time the cathode follower is replaced with a mosfet source follower.

for B+ the 2nd traffo will be wired back to back and the 220volt ct used as a full wave rectifier, uf4003 is useful here, for a B+ of around 150volts which is ample.

Galing. Cant wait for your second coming in a few years (sorry messiahnic). A real treat to local tubeheads (or ss fans). hehe

OT (di naman masyado ot since nasa "sharing mood" naman tayo)...

Anyone with a foreplay 3 schema? Id like to see how the od3's are used kasi. Thanks!
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Offline JojoD818

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Re: 12au7 substitutes
« Reply #65 on: Jul 22, 2006 at 01:29 AM »
hhmmm... pano na nga yun foreplay?  ::)

maybe this would help, more or less.

http://img.photobucket.com/albums/v70/jojod818/Dump/T-FET.jpg

« Last Edit: Jul 22, 2006 at 01:42 AM by JojoD818 »
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Offline ATJr.

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Re: 12au7 substitutes
« Reply #66 on: Jul 22, 2006 at 07:23 AM »
yes, something simmilar, but what i have in mind is a dc coupled one, no coupling capacitor between plate of 12au7 and gate of mosfet, just a 220ohm gate stopper, and 2 5.1v 1/2 watt zener back to back to serve as gate protection for mosfet. there will be just one output coupling cap......

cost of this project will be in the vicinity of P1000.... ;D
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Offline oweidah

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Re: 12au7 substitutes
« Reply #67 on: Jul 22, 2006 at 07:26 AM »
Quote from: 2ny on Jul 21, 2006 at 06:02 PM
hey oweidah,

can i interest you in a stereo line preamp, ala-FOREPLAY, but this time single 12au7 tube! ;D

uses cheap parts, 2 x 750mA 110/220 pri, 12volt secondary @P105 each, golden mars, 2 x IRF820 mosfet as source follower @P35 each from newport or oriental, jojo's favorite chassis,

what do you say? ;D

Quote from: 2ny on Jul 22, 2006 at 07:23 AM
cost of this project will be in the vicinity of P1000.... ;D

WOWOWEEEE!!! sir 2ny total cost na p0 ba ito? can do!!! rili very helpful kayo sa diy pdvd community sir 2ny! cheers! ;D

edited: :)
« Last Edit: Jul 22, 2006 at 08:57 AM by oweidah »
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Offline ATJr.

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Re: 12au7 tubes & substitutes
« Reply #68 on: Jul 22, 2006 at 07:44 AM »
yup, if you use "raon" parts ;D

here is a scheme i whipped up just now...


the irf820 is operated with a drain current of ~5mA instead of 1.6mA of the 12au7cathode follower, it will be dissipating around 600mW so no heatsink is required. i put a 470k grid leak resistor for input triode to serve as protection in case of worn out volume control, this may be ommited if you wish.
« Last Edit: Jul 22, 2006 at 07:49 AM by 2ny »
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Offline oweidah

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Re: 12au7 tubes & substitutes
« Reply #69 on: Jul 22, 2006 at 08:10 AM »
sir 2ny, i dont mind using raon parts. pls pm me your contact# & further details, if any. ;D)  tnx :)
« Last Edit: Jul 23, 2006 at 07:18 AM by oweidah »
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Offline dana

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Re: 12au7 tubes & substitutes
« Reply #70 on: Jul 22, 2006 at 08:38 AM »
Hi Sir 2ny :),

Very much interesting yan sir!
Madali lang ba gawin yan sir?
Also how about the other parts like transformer, where to buy?
How about phono in, pede ba lagyan yan sir?
Thanks rin pala sir sa pm nyo last time, medyo busy lan at di nareply...still hav other questions in my mind to ask... :)

Many thanks! :)
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Offline ATJr.

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Re: 12au7 tubes & substitutes
« Reply #71 on: Jul 22, 2006 at 08:45 AM »
Quote from: dana on Jul 22, 2006 at 08:38 AM
Hi Sir 2ny :),

Very much interesting yan sir!
Madali lang ba gawin yan sir?
Also how about the other parts like transformer, where to buy?
How about phono in, pede ba lagyan yan sir?
Thanks rin pala sir sa pm nyo last time, medyo busy lan at di nareply...still hav other questions in my mind to ask... :)

Many thanks! :)

yup, madali lang, very simple ang scheme and very simple ang parts....please reffer to earlier posts regarding parts...most of the parts can be purchased from golden mars in raon, that is in front of deeco...

this is just a preamp, or buffer if you will, gain is around unity.....the power transformer is 2 x 750mA ones and wired back to back, power consumption of this preamp is so low that you may do away with the power switch and leave the unit on all the time, but please do not ommit the fuse.

« Last Edit: Jul 22, 2006 at 08:55 AM by 2ny »
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Offline dana

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Re: 12au7 tubes & substitutes
« Reply #72 on: Jul 22, 2006 at 09:04 AM »
Thanks, sir 2ny.

Sir can you also post the power supply ckt..
Also, can you repost sir ung schematic may malabong mga portion, just to make sure...
Sarap cguro gawin ito... sandali lan gawin at listen na agad

« Last Edit: Jul 22, 2006 at 09:05 AM by dana »
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Offline ATJr.

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Re: 12au7 tubes & substitutes
« Reply #73 on: Jul 22, 2006 at 09:47 AM »
Quote from: dana on Jul 22, 2006 at 09:04 AM
Thanks, sir 2ny.

Sir can you also post the power supply ckt..
Also, can you repost sir ung schematic may malabong mga portion, just to make sure...
Sarap cguro gawin ito... sandali lan gawin at listen na agad



ok, here it goes...enjoy! ;D

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Offline dana

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Re: 12au7 tubes & substitutes
« Reply #74 on: Jul 22, 2006 at 10:36 AM »
WOW! Kumpleto na ckt, di na kailangan mag isip......Thanks very much sir 2ny for unselfishly sharing again...
I will save this ckt, hopefully can try it out...
The first step is parts muna...owediah will provide the 12au7s...hehehe...
2nd is the time and passion to do this...
Sir 2ny...sensya na, nubie sa tube diy...how to configure this ckt as buffer or preamp?

Salamat ng marami...
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Offline oweidah

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Re: 12au7 cleartops
« Reply #75 on: Jul 22, 2006 at 10:45 AM »
Quote from: dana on Jul 22, 2006 at 10:36 AM
I will save this ckt, hopefully can try it out...
The first step is parts muna...owediah will provide the 12au7s...hehehe...

dana,
ha? ??? ano kamo? ganda talaga cleartops!!! sabi ko sayo dalawang pares ang itira mo not kunin mo...joke! dame pa ba natira? sa monday ut uli ;D
« Last Edit: Jul 22, 2006 at 10:46 AM by oweidah »
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Offline JojoD818

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Re: 12au7 substitutes
« Reply #76 on: Jul 22, 2006 at 04:04 PM »
Quote from: 2ny on Jul 22, 2006 at 07:23 AM
yes, something simmilar, but what i have in mind is a dc coupled one, no coupling capacitor between plate of 12au7 and gate of mosfet, just a 220ohm gate stopper, and 2 5.1v 1/2 watt zener back to back to serve as gate protection for mosfet. there will be just one output coupling cap......

cost of this project will be in the vicinity of P1000.... ;D

so that's why you use the 820, so you can also use the tube supply as mosfet supply too. that's what I use for my headamp with an opamp frontend, then may ccs yun mosfet and running in class a. galing yan ganyan design.

wow! 1K! murang-mura na yan guys. good luck and padinig ha.  :)

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Offline s2kov

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Re: 12au7 substitutes
« Reply #77 on: Jul 22, 2006 at 06:05 PM »
my on-going project! ;D


Quote from: markmlists on Jul 21, 2006 at 08:18 PM
tayo)...

Anyone with a foreplay 3 schema? Id like to see how the od3's are used kasi. Thanks!
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Offline s2kov

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Re: 12au7 tubes & substitutes
« Reply #78 on: Jul 22, 2006 at 06:09 PM »
ok yan! ;D oh, gawin na yan! ;D


Quote from: 2ny on Jul 22, 2006 at 07:44 AM
yup, if you use "raon" parts ;D

here is a scheme i whipped up just now...


the irf820 is operated with a drain current of ~5mA instead of 1.6mA of the 12au7cathode follower, it will be dissipating around 600mW so no heatsink is required. i put a 470k grid leak resistor for input triode to serve as protection in case of worn out volume control, this may be ommited if you wish.
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Offline s2kov

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Re: 12au7 tubes & substitutes
« Reply #79 on: Jul 22, 2006 at 06:12 PM »
san sa raon meron nyan UF4003/4007?
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Offline ATJr.

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Re: 12au7 tubes & substitutes
« Reply #80 on: Jul 23, 2006 at 08:36 AM »
Quote from: s2kov on Jul 22, 2006 at 06:12 PM
san sa raon meron nyan UF4003/4007?

try mo sa deeco, otherwise, 1n4003/4007 can be used...
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Offline oweidah

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Re: 12au7a cleartops
« Reply #81 on: Jul 23, 2006 at 12:04 PM »
Quote from: Superman on Jul 21, 2006 at 05:16 PM
hi oweidah!

is it the same price?? can you post some pics?? if it is not too much to ask, pakibili naman ng 1-pair nang masubukan...i'll get in touch with you when i'm in manila in august (1st week)...OK lang ba?? baka maubusan eh :D :D :D

sir superman,

eto po yung 12au7a cleartops @spin...sensia mejo malabo pic. siguro/sana di ka maubusan, ~20 pcs ma nainiwan nung umalis ako. iniwan ko din un isang tube with clear print- 12au7a honeywell u.s.a.

« Last Edit: Jul 23, 2006 at 12:09 PM by oweidah »
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Offline Weng!

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Re: 12au7 tubes & substitutes
« Reply #82 on: Jul 23, 2006 at 12:29 PM »
hwawww bai, ang dami na ng ma-e rolling mo. keep on posting ur tubes for us to droll ::).
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Offline ATJr.

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Re: 12au7a cleartops
« Reply #83 on: Jul 23, 2006 at 01:34 PM »
Quote from: oweidah on Jul 23, 2006 at 12:04 PM
sir superman,

eto po yung 12au7a cleartops @spin...sensia mejo malabo pic. siguro/sana di ka maubusan, ~20 pcs ma nainiwan nung umalis ako. iniwan ko din un isang tube with clear print- 12au7a honeywell u.s.a.




sana me abutan pa ko pagpunta ko doon... ;D
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Offline oweidah

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Re: 12au7a cleartops
« Reply #84 on: Jul 23, 2006 at 01:52 PM »
Quote from: GneW on Jul 23, 2006 at 12:29 PM
hwawww bai, ang dami na ng ma-e rolling mo. keep on posting ur tubes for us to droll ::).

bai kasi salawahan yung isa pares rca5963 blackplate nangibang kandungan preamp na buti may cleartops pamalit. dont worry pareserba ako yung para sa iyo- si sylvia at c honey k? ;D
...handa na karton for lbc;D

truth is, tube rolling results dpende sa circuit/preamp may iba tube users sa mga forums say ok rca cleartops meron iba sabi hindi daw nag"match" sa gears nila. good luck sana mag-improve sound at tiptop tono preamp mo.....soooon!  :)

Quote from: 2ny on Jul 23, 2006 at 01:34 PM

sana me abutan pa ko pagpunta ko doon... ;D

sir 2ny, hope you'll get what you'll come for...they're just a fone call away.
http://pinoydvd.com/board/index.php?topic=54505.0   ;D
« Last Edit: Jul 23, 2006 at 02:00 PM by oweidah »
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Offline ATJr.

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Re: 12au7 tubes & substitutes
« Reply #85 on: Jul 23, 2006 at 02:08 PM »
thanks oweidah, actually i have called them up and they gave me instructions on how to reach their place.
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Offline s2kov

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Re: 12au7 tubes & substitutes
« Reply #86 on: Jul 23, 2006 at 03:39 PM »
bagay na bagay yan sa foreplay! ;D
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Offline oweidah

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Re: 12au7 tubes & substitutes
« Reply #87 on: Jul 24, 2006 at 10:07 AM »
o.t.

btw..saw couple of raytheon sylvania mediumish fattish seems 6sn7 :)
gotta recheck the price 270php each?

recheckd...its 350php each daw :) 1055H/07.24.06
« Last Edit: Jul 30, 2006 at 01:59 PM by oweidah »
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Offline markmlists

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Re: 12au7 substitutes
« Reply #88 on: Jul 24, 2006 at 08:35 PM »
Quote from: s2kov on Jul 22, 2006 at 06:05 PM
my on-going project! ;D



Congrats sir Andy. Nakakaintriga yung OD3. Ganda daw ng kulay pag-naka on.

Sir Jo, Thanks.

Sir 2ny, Salamat sa proposed project mo. Ang galing!

More power to all!
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Offline s2kov

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Re: 12au7 substitutes
« Reply #89 on: Jul 24, 2006 at 08:39 PM »
mark,

the purple glow will gets you high while playing good music! ;D ;)


Quote from: markmlists on Jul 24, 2006 at 08:35 PM
Congrats sir Andy. Nakakaintriga yung OD3. Ganda daw ng kulay pag-naka on.

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