5Y3 vs EZ81

[azatplayer]

Is there much in these two recs apart from heater voltages?
Im getting my parts together for my AC10 which uses a EZ81. I did my AC15/zwreck half power using a 5Y3 and love the results.
BUT i really really dig on the AC10 vibe and dont wanna mess with it too much.

[Mr.Curwen]

Well quickly looking at the plate characteristics, the 5Y3 has a plate resistance of around 500 ohms, and the EZ81 about 150 ohms.

This means that the 5Y3 will sag and compress more with changing currents, and the EZ81 less.

[M Fowler]

Man I just burned out another 6X4 rectifier so now I better order more and and figure out the what is causing the overloading in a Silvertone 1482.

Not sure about which would be better the 5Y3 or EZ81 for your situation.

[rdjones]

Is there much in these two recs apart from heater voltages?
Im getting my parts together for my AC10 which uses a EZ81. I did my AC15/zwreck half power using a 5Y3 and love the results.
BUT i really really dig on the AC10 vibe and dont wanna mess with it too much.

Probably as different as it gets, as far as rectifiers.
Different bases obviously, but more importantly different construction types.
2A directly heated cathode vs a 1A indirectly heated isolated cathode.
I'm not aware of any directly heated cathode 9 pin based rectos.

So it boils down to base selection, 9pin vs octal.
In 9 pin there's not as much selection; 6V4, 6CA4, EZ80 and EZ81.

Do we know how much current this circuit pulls ?

rd

[rdjones]

Man I just burned out another 6X4 rectifier so now I better order more and and figure out the what is causing the overloading in a Silvertone 1482.

Not sure about which would be better the 5Y3 or EZ81 for your situation.

6X4 is a pretty wimpy rectifier isn't it ?

I've got one amp that uses the 6X4, a Univox U45B.
It's 6X4 still "works" but has some dark spots and shows a noticeable hot spot on the cathode during testing.
(I may have exceeded limits ...)

You might consider 6BX4 or 6AV4/EZ91 for slightly higher current rating.

rd

[M Fowler]

6X4 is a pretty wimpy rectifier isn't it ?

I've got one amp that uses the 6X4, a Univox U45B.
It's 6X4 still "works" but has some dark spots and shows a noticeable hot spot on the cathode during testing.
(I may have exceeded limits ...)

You might consider 6BX4 or 6AV4/EZ91 for slightly higher current rating. RD

Steve thanks I believe I exceeded it's max voltage
I soldered in diodes instead. The original can cap had been replaced by some wimpy radial caps so I built a cap board and used existing chassis holes to mount the board. I will note voltages and adjust dropping string accordingly.

Replaced the two wire power cord for three prong too.

Mark