PinoyDVD: The Pinoy Digital Video & Devices Community
Home Theater => Audio => Tubes => Topic started by: JoeyGS on Apr 07, 2012 at 01:49 PM
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What's an equivalent tube for 12AZ7?
I have this in one of my preamp and will be needing a pair for replacement as the readings are now low.
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What's an equivalent tube for 12AZ7?
I have this in one of my preamp and will be needing a pair for replacement as the readings are now low.
pm mo si tonyt marami daw syang tubes. he might have those or suitable replacements in his small stash, almost 1,000 pcs LANG. ;D
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What's an equivalent tube for 12AZ7?
I have this in one of my preamp and will be needing a pair for replacement as the readings are now low.
You can also try John Poscablo. ;)
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What's an equivalent tube for 12AZ7?
I have this in one of my preamp and will be needing a pair for replacement as the readings are now low.
this tube is like a 12at7.....you can get 6201 tubes from gerry sta. maria...+639217430558
you may also want to try 5751 available at Balikbayan handicrafts....
12az7: http://www.shinjo.info/frank/sheets/127/1/12AZ7.pdf
12at7: http://frank.pocnet.net/sheets/093/1/12AT7.pdf
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pm mo si tonyt marami daw syang tubes. he might have those or suitable replacements in his small stash, almost 1,000 pcs LANG. ;D
tutoo yan, but my tube collection is mostly tv power tubes, and transmitter tubes, no audiophile will be interested in my collection....
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Thanks Tony, Nestor and Matk for the recommendations
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Would the 5751 be a closer substitute than the 12at7 to the 12az7?
this tube is like a 12at7.....you can get 6201 tubes from gerry sta. maria...+639217430558
you may also want to try 5751 available at Balikbayan handicrafts....
12az7: http://www.shinjo.info/frank/sheets/127/1/12AZ7.pdf
12at7: http://frank.pocnet.net/sheets/093/1/12AT7.pdf
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What's an equivalent tube for 12AZ7?
I have this in one of my preamp and will be needing a pair for replacement as the readings are now low.
My phono preamp uses 12az7, Google the net and it says it can be replaced by 12au7.
btw my preamp is precision fidelity c7. :)
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Thanks Tony, Nestor and Matk for the recommendations
Ahem. ;D
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Would the 5751 be a closer substitute than the 12at7 to the 12az7?
not really close, but can be done.....the 12AZ7 has higher filament current rating, i suspect higher tranconductance than the 12at7/6201........ditto with 5751....
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Preamp tubes:
– 12AX7A / ECC83 / ECC803 / 7025; (high gain – amplification factor = 100)
– 12AD7; (high gain – amplification factor = 100)
– 12AT7 / ECC81; (high gain – amplification factor = 70)
– 12AY7; (med gain – amplification factor = 40)
– 12AU7 / 5814 / 6189 / 5963 / ECC82; (low gain – amplification factor = 17)
– 12AZ7; (med gain – amplification factor = 60)
– 5751; (high gain – amplification factor = 70)
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magkano kaya sa Balikbayan handicraft yung 76 driver tube?
this tube is like a 12at7.....you can get 6201 tubes from gerry sta. maria...+639217430558
you may also want to try 5751 available at Balikbayan handicrafts....
12az7: http://www.shinjo.info/frank/sheets/127/1/12AZ7.pdf
12at7: http://frank.pocnet.net/sheets/093/1/12AT7.pdf
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1500 list price i think
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ok na? ;D
1500 list price i think
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JoeyGS,
I have a pair of sylvan 12az7 you can try if you are interested. NOS, used for less than 2 hours.
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Meron ako sir @ 1.2k pair NOS made in east germany 12AT7 Original boxes.
john poscablo
09228277301
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I have a phono preamp, Jolida JD9 and the tubes in the JD-9 are only for the final stage buffer, is it true that gain is not an issue in using other tubes? I plan to tube roll and the current tubes are 12ax7. Will a 12at7 be an acceptable substitute considering that this has a higher transconductance than the 12ax7? What do I expect on the output when I use the 12at7 in this phono preamp?
Preamp tubes:
– 12AX7A / ECC83 / ECC803 / 7025; (high gain – amplification factor = 100)
– 12AD7; (high gain – amplification factor = 100)
– 12AT7 / ECC81; (high gain – amplification factor = 70)
– 12AY7; (med gain – amplification factor = 40)
– 12AU7 / 5814 / 6189 / 5963 / ECC82; (low gain – amplification factor = 17)
– 12AZ7; (med gain – amplification factor = 60)
– 5751; (high gain – amplification factor = 70)
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^you can try 12at7, gain is a bit lower but you may not notice it....since the circuit was designed and optimized i hope to use the 12ax7, the RIIA equalizations will be upset somewhat since output impedance has changed....
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Mga Gurus ano tube equivalent ng ecc99 thanks in advance
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Mga Gurus ano tube equivalent ng ecc99 thanks in advance
Download Duncan's Tube Datasheet Locator here: http://tdsl.duncanamps.com/
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Thanks sir jojo!
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Thanks sir jojo!
Welcome po sir! ;)
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hi chief's,
what would be the better replacement for the electron chinese el34b? just recently changed the pre amp tubes to jan philips 12at7 wc.
thanks :)
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hi chief's,
what would be the better replacement for the electron chinese el34b? just recently changed the pre amp tubes to jan philips 12at7 wc.
thanks :)
try 6ca7 and nos/current production el34.
brand and era of tubes are subjective by nature as far as sonics are concerned. Experiment talaga, there is no way of knowing without really trying it on sa system mo sir :) what sounds good or crap in one might not hold true for your system :)
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Mga Gurus ano tube equivalent ng ecc99 thanks in advance
you can try 12BH7, rewiring the filaments for 6volts, 6GU7, 6FQ7, 6CG7 can be used....
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you can try 12BH7, rewiring the filaments for 6volts, 6GU7, 6FQ7, 6CG7 can be used....
Thanks sir tony!
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try 6ca7 and nos/current production el34.
brand and era of tubes are subjective by nature as far as sonics are concerned. Experiment talaga, there is no way of knowing without really trying it on sa system mo sir :) what sounds good or crap in one might not hold true for your system :)
6CA7 - fatboys... I have at least 4 quads of these...
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6CA7 - fatboys... I have at least 4 quads of these...
Please reserve!:)
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6CA7 - fatboys... I have at least 4 quads of these...
jojo, magkano? ano brand?
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Please reserve!:)
Ngek, personal stash lang brader... ;D
jojo, magkano? ano brand?
not for sale Tony, they are my insurance that I have power tubes to replace my amp until I grow old. nothing special, new prod electro harmonix
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ok jojo, ako rin nasa 500+ ang power tubes ko, nga lang pang TV....;D
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ok jojo, ako rin nasa 500+ ang power tubes ko, nga lang pang TV....;D
nagsisiguro ka na din pala... ;D
aside from the 4 quads of 6CA7 I also got 2 quads of Svetlana EL34 and a quad of those Melody (China?) EL34s. a bucketful of 6SN7s from coin-based to metal-based to brown-based to black-based. geez they were really super hyped!
para kahit uugod-ugod na ako may tubo pa din ang amp ko... ;D
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Good day bros, I would like to solicit from our gurus advise on this query. Preamp is an Audible illusions Modulus 3 designed for 6922, would I be putting it's health at risk in using 6BQ7A tubes in the line stage? I read they are not direct equivalent but can work depending on the circuit (to which I am clueless) :-(
Any tips and advise would be greatly appreciated.
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Good day bros, I would like to solicit from our gurus advise on this query. Preamp is an Audible illusions Modulus 3 designed for 6922, would I be putting it's health at risk in using 6BQ7A tubes in the line stage? I read they are not direct equivalent but can work depending on the circuit (to which I am clueless) :-(
Any tips and advise would be greatly appreciated.
same pinout kaya pwede....the 6922 belongs to the 6dj8/ecc88/e88cc family, 6n23 is the Russian equivalent, 7dj8/pcc88 can also be used, the Russian 6n1p can also be tried but be careful since it draws more filament current, check with the manufacturer if that can be used in your amp...me nakita na akong nasunugan ng power supply traffo when he replaced all 6dj8's in his preamp will all 6n1p's...
6BQ7 and 6BK7 can also be tried....
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...me nakita na akong nasunugan ng power supply traffo when he replaced all 6dj8's in his preamp will all 6n1p's...
6BQ7 and 6BK7 can also be tried....
That's what I was afraid of sir, does the 6BQ7 draw more current or negligible ?
I am thinking since the Modulus prefers higher versions of 6992 ie sturdy russian 6992 / 6H23N and the likes, then it must have high current in its circuit.
Since 6BQ7A is a predecessor of 6DJ8 then it must be leaner and with its use in the Modulus it will just have a shorter life span and not get the Modulus in trouble....sorry noob knowledge and observations lang po :-)
Thank you master Tony for taking your time to respond to my query, salamat po.
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of all those tubes mentioned, only the 6N1p have higher filament current demands about 2 to 1 ....
http://tdsl.duncanamps.com/show.php?des=6922
http://www.radiotechnika.hu/images/6N1P.pdf
so unless you are sure that your power traffo can take the added load, don't....;)
stay away from the 6N1P unless the manufacturer of your preamp can confirm it is okey to use...
so all the others are ok to use....
you can even try the 6CG7/6FQ7 in there...if you can find the 6KN8, or the Japanese 6R-RH8, you can try those as well...Gerry Sta Maria(523-7551) has some 6R-RH2 and you can ask him for a demo....:)
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Thanks master Tony, I will proceed as advised :-)
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any updates?