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  #16  
Old 06-14-2017, 05:41 PM
Gmountain Gmountain is offline
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Thanks for the information. Maybe I should look for a tube radio.
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  #17  
Old 06-14-2017, 06:24 PM
clintj clintj is offline
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Quote:
Originally Posted by M Hayden View Post
Unless they're cathode-biased, but that isn't very common these days.
There's still quite a few out there. The Peavey Classic 15/30/60 series, most Vox, Matchless, Bad Cat, clones of the 18W Marshall and smaller Fender tweeds, almost all single ended class A amps....

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  #18  
Old 06-14-2017, 06:29 PM
Steve DeRosa Steve DeRosa is offline
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Quote:
Originally Posted by M Hayden View Post
Unless they're cathode-biased, but that isn't very common these days.
While definitely not as common as it used to be, cathode bias is enjoying a resurgence of popularity as players rediscover the unique tonal properties; in terms of production amps all Vox AC Series amps are still cathode-biased TMK, as are some of the current Supro offerings. In addition, a number of boutique builders offer amps based to a greater or lesser degree on tweed-era Fender or early-60's Vox circuitry, and some manufacturers (Supro, Bugera, Carvin, Mesa, et al.) offer a class-A cathode/class-AB fixed bias switching option that allows the user to not only toggle between power levels but achieve two (or more) dramatically different tones from the same amp; when you factor in the different tube combinations that can be installed there's a world of possibilities..

Quote:
Originally Posted by blue View Post
Heck, just back in the late 90's there was doom and gloom about "no more tubes. Only crappy Russian and Chinese ones, and we'll run out of those in a few years..."
Quite frankly, the Russian/Chinese stuff that was being offered then was crap (still is in some cases, particularly the MIC OEM tubes you find in many - if not most - low- to mid-price tube amps these days); fortunately, there's been a good deal of progress in terms of both availability and construction. One little secret among tube junkies is that, just as we here in the US have the military-surplus JAN tubes (the ones that the hard-core Fender guys would sell their gonads to get - and not without good reason), there's a whole batch of pre-Glasnost Soviet mil-spec tubes that have been finding their way here for the last decade or so - and these come a whole lot cheaper; another is that Shuguang (China's largest manufacturer) produces tubes at three different quality levels, the highest of which are fully competitive with many of the best vintage tubes according to reviews (and my own experience with some of their 12AX7's). Finally, the Russians have been developing a line of KT-Series uber-tubes - KT-90, KT-120, KT-150 - that have been enthusiastically embraced by the audiophile world; FYI the KT-150 (an all-new design resembling nothing else past or present) is claimed to be capable of producing 300 watts from a single pair in class-AB (we're talking SVT territory here, folks) - I'm just waiting for someone to design the ultimate bass combo around a set of these puppies and a 15" neodymium speaker...
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  #19  
Old 06-14-2017, 06:54 PM
Cochese Cochese is offline
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Did the OP mention what type of amp and what tubes they are changing?
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  #20  
Old 06-14-2017, 06:56 PM
Gmountain Gmountain is offline
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Quote:
Originally Posted by Cochese View Post
Did the OP mention what type of amp and what tubes they are changing?
No, he didn't, but it's a Marshall DSL15 and the tubes are ECC83 pre amp.
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  #21  
Old 06-14-2017, 09:03 PM
dragon1952 dragon1952 is offline
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nm........................
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  #22  
Old 06-15-2017, 08:16 AM
Cochese Cochese is offline
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Preamp tubes are very easy to swap out. Just make sure the amp is off and be careful not to bend the pins. I probably would take it to a tech though if you aren't experienced with tubes. Even swapping out preamp tubes requires a bit of understanding.
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