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Old 26th December 2006, 08:33 PM   #1
kegger is offline kegger  United States
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Default 40mu tube preamp suggestions?

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.
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Old 27th December 2006, 02:59 PM   #2
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Default 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.
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Old 27th December 2006, 03:17 PM   #3
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Default 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.
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Old 27th December 2006, 03:23 PM   #4
kegger is offline kegger  United States
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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.
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Old 28th December 2006, 12:16 AM   #5
Sheldon is offline Sheldon  United States
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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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Old 28th December 2006, 01:28 AM   #6
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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
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Old 28th December 2006, 01:56 PM   #7
kegger is offline kegger  United States
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Default Another circuit

Here's another circuit that simms pretty nice.

Any thoughts on how this looks?
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