40mu tube preamp suggestions?

kegger · 26th December 2006, 08:33 PM

Trying to see if there are any decent preamp designs for 40ish mu tubes.

No I don't need all that gain but have a lot of the 9pin 40ish gain tubes
like 5965, 12AV7, 6829, and E180CC and was thinking of trying a preamp
that utilized one tube (both triodes) per channel in a unit.

Here's one schem I'm throwin about in spice at the moment.
Any suggestions are more then welcome,
Thanks.

grhughes · 27th December 2006, 02:59 PM

If you're looking for a fine audio tube in this category, I'd look at a 12ay7/6072a. I would be worried about equivalent input noise and freedom from microphonics. Every tube would have an optimum Rk (cathode resistor)which would give the lowest equivalent input noise.

grhughes · 27th December 2006, 03:17 PM

I looked up two of the tubes you mentioned. They were made for computer use to operate under cut off and cut on conditions for long periods under 0 bias conditions. One manuals say the E180cc was not made for applications where low noise and low microphonics are a primary concern.

kegger · 27th December 2006, 03:23 PM

All of the tubes I mentioned are used in many designs as the phase splitter tube amung others.
The poinz 6v6 amp, which is a pretty highly regarded amp uses the 5965 family of tubes upfront.

These are actually quite nice tubes for audio, if you haven't tried any you should give um a listen.
I'm using them in the phase splitter of my modded ST-70 with some very nice and quiet results.

Sheldon · 28th December 2006, 12:16 AM

An Aikido? Some of the tubes are in this table, but you could make a real close guess on the values for others by comparing with similar tubes. This circuit topology tolerates a good range of operating conditions. Can even swap many tubes with no component changes.

http://www.tubecad.com/2006/05/blog0064.htm

Sheldon

Audio_idiot · 28th December 2006, 01:28 AM

Hi,
5965 is a sweet and warm sounding tube, you can wire both triode in common cathode, it will be non-inverting too.

Or SRPP, or use the other half as active load or CCS...

Happy trying

kegger · 28th December 2006, 01:56 PM

Here's another circuit that simms pretty nice.

Any thoughts on how this looks?

27th December 2006, 02:59 PM	#2
grhughes diyAudio Member Join Date: Mar 2005 Location: Cubicle Sweet Cubicle, Springfield, Missouri, USA	For What? Application? If you're looking for a fine audio tube in this category, I'd look at a 12ay7/6072a. I would be worried about equivalent input noise and freedom from microphonics. Every tube would have an optimum Rk (cathode resistor)which would give the lowest equivalent input noise. __________________ " Where's the KABOOM? There is supposed to be an earth shattering KABOOM." MM

27th December 2006, 03:17 PM	#3
grhughes diyAudio Member Join Date: Mar 2005 Location: Cubicle Sweet Cubicle, Springfield, Missouri, USA	E180CC, 5965 were made 0bias condition tubes I looked up two of the tubes you mentioned. They were made for computer use to operate under cut off and cut on conditions for long periods under 0 bias conditions. One manuals say the E180cc was not made for applications where low noise and low microphonics are a primary concern. __________________ " Where's the KABOOM? There is supposed to be an earth shattering KABOOM." MM

28th December 2006, 01:28 AM	#6
Audio_idiot diyAudio Member Join Date: Feb 2006 Location: Malaysia	Hi, 5965 is a sweet and warm sounding tube, you can wire both triode in common cathode, it will be non-inverting too. Or SRPP, or use the other half as active load or CCS... Happy trying __________________ Audio_Idiot

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27th December 2006, 03:23 PM	#4
kegger diyAudio Member Join Date: May 2004 Location: michigan	All of the tubes I mentioned are used in many designs as the phase splitter tube amung others. The poinz 6v6 amp, which is a pretty highly regarded amp uses the 5965 family of tubes upfront. These are actually quite nice tubes for audio, if you haven't tried any you should give um a listen. I'm using them in the phase splitter of my modded ST-70 with some very nice and quiet results.

28th December 2006, 12:16 AM	#5
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	An Aikido? Some of the tubes are in this table, but you could make a real close guess on the values for others by comparing with similar tubes. This circuit topology tolerates a good range of operating conditions. Can even swap many tubes with no component changes. http://www.tubecad.com/2006/05/blog0064.htm Sheldon

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