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What is the difference between the different SVT's?

#42
I haven't compared them directly, but I've used many a Sovtek-loaded SVT and they sound like proper SVT's to me. They're the cheapest tubes you can get, but that doesn't mean they're bad performers. It would only be slightly shocking to me that they still work after 11 years. That's quite long but not unheard of. Tubes aren't light bulbs, after all ;)

And New Sensor/EHX has used the Sovtek name since the late 80's, I believe.
 
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#44
Slpbass81 said:
Maybe a good investment for Ampeg is to purchase the patent for winged C tubes and start making them?
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Tube makers sell way more military tubes and audio is already just a niche compared to the military market, so only making one type of tube is a niche within a niche. Can't see where it would benefit them personally.
 
#47
Tubes are somewhat resistant to the EMP that is generated, when nukes are detonated .... I just recently re-tubed my SVT-CL with Sovteks, I would always try to have any power tubes burned in, some of the better tube retailers will burn them in, but most don't have the equipment to burn in 6550's at there operating voltages, However, Beans found one, Sovtek 6550WE - precision matched
 
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#50
One significant difference in the older SVTs (and VRs) compared to the CLs is the midrange circuitry. The older models use three triodes to produce a negative feedback arrangement. This in essence acts like a "discrete" op-amp, capable of driving the midrange inductor as an active EQ. Some have claimed the mids are more grindy/musical on these models. The CL uses a passive cut/active boost on a single triode. This would sound different on the specific mid frequencies when cutting/boosting, depending on how you use the EQ, and how hard you play.
 
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#52
Azure Skies said:
One significant difference in the older SVTs (and VRs) compared to the CLs is the midrange circuitry. The older models use three triodes to produce a negative feedback arrangement. This in essence acts like a "discrete" op-amp, capable of driving the midrange inductor as an active EQ. Some have claimed the mids are more grindy/musical on these models. The CL uses a passive cut/active boost on a single triode. This would sound different on the specific mid frequencies when cutting/boosting, depending on how you use the EQ, and how hard you play.
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Excellent info and thanks for that (I didn't even know that!), but I have to say that in all practicality, I don't think it makes a difference on settings that are duplicated on both. At least I have noticed anything while sitting here at home and ABing my 69 and Heritage CL.
 
#56
Slpbass81 said:
What is the best place to purchase matched, burned in tubes? Last time I had my amp repair guy do it because I was getting some other things adjusted and he ordered/burned in the tubes.
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I've had good dealings with tubedepot.com in the past. They have a few testing/matching options to choose from.
 
#57
i also got a nice set of tung sol 6550 from TCtubes, been going strong 4 or 5 yrs now.

they only have kt120 tungsol or sovtek 6550we so i might just let my tech get tubes next time and burn them in/test them til he gets a set to his satisfaction.
 

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