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Audio and Video Talk
Valves / Vacuum Tubes
Vintage Mullard EL34's : advice please
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<blockquote data-quote="Qualityten" data-source="post: 979396" data-attributes="member: 17776"><p>Hi marantz123</p><p></p><p>Conventional wisdom is that it is more important to have matched valves, or at least matched pairs for the ST70, rather than matched manufacturers. As it happens, the nicest looking Mullard EL34 marked xf2 that I have has a shorted heater and will never work again. It just looks too nice for me throw away! But, honestly, I think vintage Philips ones would be just as good.</p><p></p><p>My ST70 has a replacement driver board supplied by VTA (Vacuum Tube Audio) in the USA, which uses three ECC81s and can separately bias each valve. With your ST70, why not run a pair of Mullards on one side, and another pair of no-name brands on the other, and compare channels?</p><p></p><p>At present, I have some newish, good quality Shuguang 6CA7 valves in it, but it sounds just as good with the cheap no-name brand Chinese tubes that I usually use there. Meanwhile, look out for old PA or guitar amps running EL34s. Or, you might contact Mr Latsky of the Latsky Radio Museum in Vanrhynsdorp to see if he can help you.</p></blockquote><p></p>
[QUOTE="Qualityten, post: 979396, member: 17776"] Hi marantz123 Conventional wisdom is that it is more important to have matched valves, or at least matched pairs for the ST70, rather than matched manufacturers. As it happens, the nicest looking Mullard EL34 marked xf2 that I have has a shorted heater and will never work again. It just looks too nice for me throw away! But, honestly, I think vintage Philips ones would be just as good. My ST70 has a replacement driver board supplied by VTA (Vacuum Tube Audio) in the USA, which uses three ECC81s and can separately bias each valve. With your ST70, why not run a pair of Mullards on one side, and another pair of no-name brands on the other, and compare channels? At present, I have some newish, good quality Shuguang 6CA7 valves in it, but it sounds just as good with the cheap no-name brand Chinese tubes that I usually use there. Meanwhile, look out for old PA or guitar amps running EL34s. Or, you might contact Mr Latsky of the Latsky Radio Museum in Vanrhynsdorp to see if he can help you. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Vintage Mullard EL34's : advice please
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