[gibosi]

If you don't know what else to do with that crummy metal-base GZ34, you can send it to me.

 

[attmci]

I recently acquired the mullard gz34 metal base 1957 i have been critically listening to it for the past
few days and was generally comparing it to the fat base gz34 .
in comparison i thought the metal base sounded cold and did not have that magic warmth that the
fat black base has , dynamics are amazing on the metal base but just thought it was missing something
couldn't quite put my finger on it but all i can say is that i prefer the fat black base over the metal base
it just did not hit the sweet spot for me and i could not see what all the hype is about , the metal base
is over rated imho.

Leave it in the amp. Let it "warm up" for 100 hrs. It's a very nice "small" tube.

 

[Nicholasheadfi2]

Leave it in the amp. Let it "warm up" for 100 hrs. It's a very nice "small" tube.

as i said in an earlier post the metal base tube i have has not been used for many years at least 20 years but prior to that do not
know how long it was used for , surely it does not need breaking in again or does it , i thought only a few hours on it would of
done the trick , what do you think guys shall i give it another 100 or so hours before i decide to sell it .

 

[Nicholasheadfi2]

If you don't know what else to do with that crummy metal-base GZ34, you can send it to me.

i will send it first class lol

 

[gibosi]

In general, Philip's Holland-made rectifiers (and double triodes) are not as warm as those manufactured by British Mullard, which I assume is the source of your fat base gz34. Since you seem to prefer the Mullard sound, I would encourage you to try the GZ32, GZ33 and GZ37. These were all manufactured in Mullard's Blackburn factory and have a similar warm tone. And you might also like the Cossor 53KU / CV378, sometimes called a "Fat GZ37", which is also a bit warmer.

 

[Autostart]

In my experience I haven't had a rectifier changed the sonic performance much if at all. Granted I've only tried a few select 5U4G, 5U4GB and 5Z4. Am I missing something or is there a rectifier that is highly recommended?

 

[gibosi]

In my experience I haven't had a rectifier changed the sonic performance much if at all. Granted I've only tried a few select 5U4G, 5U4GB and 5Z4. Am I missing something or is there a rectifier that is highly recommended?

Some amps are more revealing of the sonic differences in rectifiers than others. I have a Glenn OTL, and it is very revealing.

That said, I am assuming your 5U4G, 5U4GB and 5Z4 are American-made. If so, you might want to try some of the European rectifiers, such as Mullard, GEC, Cossor, Brimar and Philips, as they sound quite different to my ears.

 

[Autostart]

I'm using a Woo WA22 for an amp and all put one have been an made in USA. The 5Z4 is a Brimar which like you said to sound a bit warmer and the most change out of all.

 

[abvolt]

You should give a Brimar CV1863 (5Z4GY) from Langrex.com or their ebay store it's only about 35. I find it one of my favorites. For me different rectifiers make a very big impact on my music..enjoy

 

[Autostart]

You should give a Brimar CV1863 (5Z4GY) from Langrex.com or their ebay store it's only about 35. I find it one of my favorites. For me different rectifiers make a very big impact on my music..enjoy

I will check when I get home.but I think that's what I have.

 

[Autostart]

Yep!

 

[abvolt]

Cool I would also like to suggest trying some of the Mullards like GZ30,32,33,34,37 all of them have very good sq, the 33 & 37 look much alike but do sound different. 6106's are also nice, none are real spendy, since you now own a wa22 their are a lot of tube rolling options that's why I got my wa22 I find rolling enjoyable and the combo's one can make is exceedingly large..have fun

 

[Autostart]

Cool I would also like to suggest trying some of the Mullards like GZ30,32,33,34,37 all of them have very good sq, the 33 & 37 look much alike but do sound different. 6106's are also nice, none are real spendy, since you now own a wa22 their are a lot of tube rolling options that's why I got my wa22 I find rolling enjoyable and the combo's one can make is exceedingly large..have fun

Thank you for the suggestions. Much appreciated.

 

[attmci]

as i said in an earlier post the metal base tube i have has not been used for many years at least 20 years but prior to that do not
know how long it was used for , surely it does not need breaking in again or does it , i thought only a few hours on it would of
done the trick , what do you think guys shall i give it another 100 or so hours before i decide to sell it .

Well, a $2-300 tube won't change a $2000 amp to a super duper one.

There a small amount of gas built up in the tube during those 20 some years storage time. Burn-in may help to get rid of the trace-level gas inside the tube. But it won't dramatically change the sound. Feel free to sell it to Ken. He need one. LOL

 

[attmci]

Yep!

This is a good one. But they double the price of the tube after some head-fiers purchased dozens of pairs.