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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Sylvania 5751 3 mica gray plate (different varieties?) posted by posbwp55@msn.com on April 19, 2007 at 17:46:25:
You have to understand that the Jan tubes came into prominence decades later and are supposedly a low cost version of the 5751. I still like them but it is not a fair to compare them to the older tubes.I am being truthful when I say the true triple mica 1950-very early 60s Sylvania grey are all full,lush and sweet sounding tubes. The negatives are that any 5751 may not sound their best or even function in certain circuits because they are by a lower gain tube. If you use them when the circuit may need a 12AX7 clearly it will not sound good. Thus if you are trying to use them as phase splitters or followers or in a gain position of a marginally powerful phono stage they don't work out, 12AX7 are more versatile. The other negative I can tell you about,in particular the older Sylvamia greys are that they are not the cleanest 5751 you can get and can get loose on you.
You ask about their treble. It is not a firecracker sparkling star but very musical and pleasant. The treble is more overwhelmed than absent and therefore a small step back compared to the mids and lower. The detail is there but a tad recessed, since you seem to want a sweeter sounding tube the grey plates are a good choice. They are less edgy than all but the older GEs. If you really want a hyperdetailed sounding tube definitley try the Raytheons and see if you can get a well preserved, strong TMBP RCA they are both very clean with excellent definition and range . The holy grail Sylvania triple Mica Black Plate with square getters, which is the only way they made them, has the clean sound and definition but IMHO they hose the competition by having the best tone and controlled low end extension in addition to the quiet musical sound that is elusive in tubes. BTW the I forgot to tell you the RCAs are frequently superb stagers.
If you want a less intense quieter tube type the 5751 is likely to please you. They seem like they give me the imaging of a great 12AU7 while not letting all that current shoot by.
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Follow Ups
- Re: Sylvania 5751 3 mica gray plate (different varieties?) - Mechans 20:58:04 04/20/07 (1)
- Re: Sylvania 5751 3 mica gray plate (different varieties?) - posbwp55@msn.com 09:38:17 04/21/07 (0)
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