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Tube rolling question on phono preamp

I am trying out a Pro-ject tube box DS2 phono preamp. I do not know what the pair of 12AX7 stock tubes are as there are tube coolers around them (looks corrugated) which are adhered to the tube and will not come off. I read somewhere that it might tung-sol reissue 12AX7s. The unit is pretty quiet at my listening level.

Anyhow, the question is what current production 12AX7s do you recommend that is low in microphonics and quiet enough to be in a phono stage? I can entertain a NOS pair if the cost is less than $100/pair. I was thinking of GL 12AX7s.

Also since the stock ones have the tube coolers around them, do I need to get pair of tube coolers as well since the existing ones do not come off? Where should I look for it? Does the tube cooler help with microphonics as well?

TIA.
-------
I. Dandaroy

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Topic - Tube rolling question on phono preamp - dandaroy 18:46:18 10/23/20 (35)
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