Tube rolling suggestions for Pathos amp

banjoman

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Just got hold of a Pathos Logos amp from a very nice wammer.

Its a hybrid amp and I believe the pre amp section has 2 Sovtek E88CC / 6922 valves.

Want to try some different valves - hoping to get a bit more fullness/warmth and bigger bass.

Any suggestions for what to try? NOS Tesla E88CC valves seem pretty cheap while Mullards are quite pricey.

 

banjoman

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Thanks Alan. Assume you meant the Siemens E88CC valves?

Unfortunately, going by eBay prices, they seem to be pretty pricey as well - similar to Mullards or more

 

myrman

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Tried a variety in mine and it barely made any noticeable difference. The Classic was the same. Save your money and buy some music.

 

Valvebloke

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Thanks Alan. Assume you meant the Siemens E88CC valves ...
Not necessarily. Unusually, for 88s the P-series and the E-series have similar heater voltages. Depending on the manufacturer the Ps are spec'd for a slightly higher voltage. So if you drop them into an amp designed for Es then they will run a bit below par. Some folks feel that this works well.

VB

 

banjoman

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Tried a variety in mine and it barely made any noticeable difference. The Classic was the same. Save your money and buy some music.
Thanks for the heads up. Thing is - the amp is a bit old and I probably need to change the tubes very soon anyway. So, wondering what would be the best replacement

 

Sumdumgi

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I'm with Nick on this. I think it's possible to get some minor improvements (or changes) but the Logos seems fine with the Sovteks and I don't think you will get any massive changes which would justify any significant spending on tubes either. So saying a month or so back one of my Sovtek's went pop, fortunately I had a spare set (which I seem to remember I got from Nick :) ). I'd always thought having a spare set around was a good idea so replaced my spares with these http://www.watfordvalves.com/product_detail.asp?id=3185

As it happens these newly bought Electro Harmonix I do think produce something slightly different to the Sovteks - which I do prefer. The Sovteks are back as the spare set. There isn't a massive immediate perceptive difference but after a few days I definitely think there is increased detail and a better soundstage. It isn't night and day but I found it an an appreciable small worthwhile improvement.

What I would recommend is that you should invest in a new set of tubes anyway (unless the previous owner has just changed them ?). With a new set you at least know that any performance reduction in the tubes over the amps previous life has been eradicated.

Congrats on joining the Pathos Logos owners club :^ It's a great amp, I absolutely love mine and wouldn't part with it.

 

AlanB

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Thanks Alan. Assume you meant the Siemens E88CC valves?Unfortunately, going by eBay prices, they seem to be pretty pricey as well - similar to Mullards or more
No I did mean PCC88. I prefer them to the more expensive E88CC.

The JAN Philips 6922's are also good value for money.

 

GJO

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As already stated,not much,maybe a bit more bottom end,but hard to notice,I have quite a few spare types if you want to try some.

Thanks Graham.Did you find any difference with these compared to the stock Sovtek tubes?
 

banjoman

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Thanks Graham. Ordered a pair of Teslas (dirt cheap) to start with and might well take you up on your offer to borrow some of your spares to try

 

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