[regap25]

Is there a list of the rectifiers that can be used with Cornet 2? Would be nice...

[galyons]

The search AC engine is your friend!  Then reinforce with Google.
 
Jim's Butcher's Bill calls out the Sovtek 5Y3GT (unlike a "real" 5Y3GT, the Sovtek is indirectly heated, hence a slower power ramp)

I use:
Bendidx 6106
GE 6087
(I like the sonics and the slow power ramp from these)

Others have used:

Mullard 5AR4 Metal base,
Mullard 5AR4 Fat base,
Mullard  other 5AR4,
Amperex 5AR4

RCA-Sylvania-Raytheon-Mazda, etc.  5Y3GT's, 
Sylvania-Raytheon-Zenith-RCA 5V4's

Plus many more variations have been tried. The voltage drops differ, so always check the spec sheets.  The B+ voltage, measured after R221,  should be 330v.  You may need to tweak the values of R220 and R221 to achieve 330v with  any other rectifier than Jim's spec.

Cheers,
Geary

[WGH]

I use a 5V4GA RCA, NOS/NIB, branded CBS with excellent results, and it is the preferred indirectly heated tube.

The heater voltage (H+) needs to be adjusted with every rectifier change so it is around 6.2-6.3 volts. The heater voltage thread is here:
http://www.audiocircle.com/index.php?topic=41430.0

Wayne

[Grinnell]

So we need to adjust the heater voltage even if we change a 5Y3GT with a 5Y3GT?  If its the same brand tube?

Thanks

[poty]

Full solution for the heating voltage stabilization is - regulated power supply, which is achievable as mentioned in several posts earlier.
In other way - I don't think you should bother about the voltages greatly - according to the USA standards - the voltage could swing from 114 to 126V (+/-5% deviation), which normally led to (middle point 6.2V) 5.89-6.51V heater voltage changes. Tuning the resistor every time is unpractical, so...

[regap25]

O.k So far we have:

6106
6087
5AR4
5Y3GT
5V4


 I used a Mazda 5y3gb and a Visseaux 5y3gb. Anyone know if a 5z3, 5u4g, type 80 Will work? Probably need to add a 4 pin socket adapter?

[galyons]

Type 80 is a mercury vapor tube allowing even higher current.  Not needed. The C2 is a preamp.  The tube current draw is low.  Check the data sheets for the rectifier tube specs.

This is a valuable tube data base site:
http://tubedata.tubes.se/sheets69.html

Although written for guitar amps, this is a helpful relative reference:

http://www.300guitars.com/articles/rectifier-tube-voltage-drop-chart/

No reason to over think this. 

Cheers,
Geary

[regap25]

Type 80 is a mercury vapor tube allowing even higher current.  Not needed. The C2 is a preamp.  The tube current draw is low.  Check the data sheets for the rectifier tube specs.

This is a valuable tube data base site:
http://tubedata.tubes.se/sheets69.html

Although written for guitar amps, this is a helpful relative reference:

http://www.300guitars.com/articles/rectifier-tube-voltage-drop-chart/

No reason to over think this. 

Cheers,
Geary

Sorry but noone is over thinking this. It's simple request for customers to know which types of rectifiers are interchangeable. I always thought the type 80 was an equivalent to the 5y3 except for the pins:

http://www.fourwater.com/files/fullrect.txt