Which 12AU7 and 6V6GTs?

Psychobiker · 3rd December 2007, 12:27 PM

Hey,

Just curious over which brand to buy, this is my first valve amp project, hence the question

. I've heard Golden Dragon are a bit iffy, so despite the guy at Tube Shop 's advice....I'll ask you guys.

I'd ideally like to shop there, if possible

L

Brett · 3rd December 2007, 07:28 PM

Guitar or hifi?

Psychobiker · 3rd December 2007, 07:56 PM

Hifi, sorry!

L

Brett · 3rd December 2007, 08:11 PM

Quote:

Originally posted by Psychobiker
Hifi, sorry!

L

Use something else other than a 12AU7, such as a 6SN7, ECC99, 6H6N.
Sorry it's not the answer you're looking for, but I only ever use them in MI amps, and only to serviceold models.

On a general note though, of the new production Russian tubes, I really don't find that much difference between those I've measured (in cct) beween equivalent types.

6V6's I've used in a guitar amp build recently, but the poweramp side is typical AB hifi design and it went very well with the EH's. So I'd suggest try them or JJ.

Also, don't limit yourself to that store. Plenty of place in the US and for a few tubes, postage won't come to much, esp with current exchange rates.

ray_moth · 3rd December 2007, 11:29 PM

Quote:

don't limit yourself to that store

Agree! They claim "The largest selection of quality tubes online" but I didn't see any 6CG7 or 6FQ7, which are true 9-pin equivalents of the 6SN7 and are much better for audio than the non-linear 12AU7.

7N7 · 3rd December 2007, 11:34 PM

Yes, I'll second (third actually) that.

12AU7/ECC82? Horrible things.

7N7

Psychobiker · 3rd December 2007, 11:37 PM

Many thanks again guys, the 6SN7 looks to be the way forward, not too much fiddlement to be made

L

Psychobiker · 6th December 2007, 08:55 AM

Just checking, all I really need to do is bring down the Anode voltage to + - 250v, the transconductance is lower than the 12AU7, which apparently is fine. All the rest of the power supply etc remains the same, which is over-engineered for a 6SN7GT, meaning a less stressed PSU

L

316a · 6th December 2007, 09:36 AM

7C5 is a loctal 6V6 , maybe an idea to use these instead as NOS is plentiful and cheap . 7AF7 is a loctal 12AU7 so you may be able to build an all-loctal amp

An oddball valve which is very much like a 20w dissipation directly heated 6V6 is the 1624 (glass) or 1619 (metal)

cheers

316A

Psychobiker · 6th December 2007, 10:42 AM

Yeah, All the same sockets would be handy! Nothing too much in the circuit to change tho? I'm sticking with the 6V6, but changing the preamp tube to a 6SN7 as per recommendation

L

3rd December 2007, 12:27 PM	#1
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Which 12AU7 and 6V6GTs? Hey, Just curious over which brand to buy, this is my first valve amp project, hence the question . I've heard Golden Dragon are a bit iffy, so despite the guy at Tube Shop 's advice....I'll ask you guys. I'd ideally like to shop there, if possible L

3rd December 2007, 11:34 PM	#6
7N7 diyAudio Member Join Date: Jan 2003 Location: England	I never miss an opportunity Yes, I'll second (third actually) that. 12AU7/ECC82? Horrible things. 7N7 __________________ Plug them in and light them up

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3rd December 2007, 07:28 PM	#2
Brett diyAudio Member Join Date: Jan 2002	Guitar or hifi?

3rd December 2007, 07:56 PM	#3
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Hifi, sorry! L

3rd December 2007, 11:37 PM	#7
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Many thanks again guys, the 6SN7 looks to be the way forward, not too much fiddlement to be made L

6th December 2007, 08:55 AM	#8
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Just checking, all I really need to do is bring down the Anode voltage to + - 250v, the transconductance is lower than the 12AU7, which apparently is fine. All the rest of the power supply etc remains the same, which is over-engineered for a 6SN7GT, meaning a less stressed PSU L

6th December 2007, 09:36 AM	#9
316a diyAudio Member Join Date: Dec 2002 Location: West London	7C5 is a loctal 6V6 , maybe an idea to use these instead as NOS is plentiful and cheap . 7AF7 is a loctal 12AU7 so you may be able to build an all-loctal amp An oddball valve which is very much like a 20w dissipation directly heated 6V6 is the 1624 (glass) or 1619 (metal) cheers 316A

6th December 2007, 10:42 AM	#10
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Yeah, All the same sockets would be handy! Nothing too much in the circuit to change tho? I'm sticking with the 6V6, but changing the preamp tube to a 6SN7 as per recommendation L

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