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In Reply to: Re: Rectifier Flashing.... posted by Robert H. on September 07, 2002 at 14:01:50:
Hi,Thanx for advice Robert, I was naive and stupid about the current draw, and ignored it as they both are rated at 5V. I'll just use the Russian 5U4G for the meanwhile instead I guess. The large base Mullard GZ34 seems to lack headroom when I want more volume alright. And thanx for the reassurance that the Mullard 6X4's flashing is normal. I hope the amp is fine though *fingers crossed*.
Follow Ups:
Yeah, the voltage drop on the GZ34 is much less than a 5U4G, so that'll drop the headroom a bit much.You can get some very good 5U4's for a reasonable price that will give you a big time better sound, look for Tungsol 5U4GB's - which are knock-out fantastic, also don't discount 1950's/early 60's GE 5U4GB's which are very good too, both can be found for a reasonable price.
Hi Robert,I've seen GE 5U4GB's which have a straight glass compared to the coke bottle type typical of 5U4G's. Are these the 50's-60's types you recommend? Maybe there are Bendix type 5U4's too....
No, there never was a Bendix 5U4 type made. Bendix tubes can be variable in sound anyways, some are good, others not so.There are GE 5U4GB's of every vintage imaginable. GB's are always straight glass. Don't get hung up on the fetish of believing the older coke bottle types are always superior, some are great - old Tungsol, Sylvania, for example, some are not so spectacular - the NU, KenRad come to mind. Some GB's are awful - later Sylvanias are one - but late 50's Tungsol, RCA or GE are very good.
There never was a good Euro 5U4 type, except the GEC U52 which is very good, and Mullard GZ series. There are some god-awful Euro types floating around with names like Ultron, etc. which are to be avoided.
I think your amp uses a single rectifier, if so, this is an advantage because singles pop up on Ebay all the time at good prices.
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