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VTL TL2.5---factory installed tubes?

Hello---I recently purchased a used VTL TL2.5 pre here on Audiogon and was wondering if anyone knows what tubes VTL originally installed in this model at the factory.

The seller included several pairs of various brand 12au7 tubes (Tung Sol, Tesla, Phillips), but I don't really know which ones "belong" in there. The Tung Sol tubes were in there when I got it, but those turned out to be way too microphonic, as well as giving off a high-pitched hum. I've got the Teslas in there now, they sound better than the Phillips to my ears. But I have the feeling this preamp isn't reaching it's full potential with these tubes, and I figure a good place to start would be to get the original VTL approved, factory-installed ones.

I e-mailed VTL about wanting to buy new stock tubes from them, but never got a response. Called and left a message, and they never returned my call. What gives?

I'm new to tubes, so any advice would be appreciated. Thanks, Will Herrera
will_herrera

Showing 1 response by kehut

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kehut
668 posts
 
Will,

Ive been down this road with the 2.5. The choice of 12AU7's will definitely be a "preference" sound. I settled on the Telefunken Smooth Plate after trying many such as the Mullard,RCA Clear Top and Black Plate 5814A to name a few. To me the Tele's were best.Smoothest highs and mids, which were a priority to me.

The 2.5 in its earlier iteration used the 6350 driver tubes instead of the new units 12AT7..Not sure which you have..Mine used the 6350 and I liked the vaunted and good sounding 60's Sylvania 6350 NOS types with yellow print label. I got them from Brendan at Tubeworld for ~ $65/pair or so as I recall, a few years back.. If yours uses the 12AT7..again, you may have to try differing brands. My current tube pre amp uses Telefunken 12AT's and I really like them.
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