diode sub for 35Z5?

[chuggy]

I'd like to substitute diode rectification in my Kay 703 which has a dead 35Z5 half wave recto. 
Would this involve a single diode or string from cathode to plate? What diode(s)? A resistor to substitute for the series heater would be needed.  The data sheet says heaters run at 35 V with .15 A current.... so 233 or so ohms bridging the heater connections?

THANKS-
JIM

[sluckey]

You can use a single 1N4007. Put a sag resistor in series with it to keep the B+ about where it was with the tube. I'd start with 100Ω but experiment to find the best value.

Your math looks good for the filament replacement resistor. Use at least a 10 watter.

You can buy a 35Z5 for $9 at AES. They also have a 35Z4 which should work fine for $2.50.

[Tiny_Daddy]

Unless the filament is out, just wire a 1N4007 across pins 5 and 7 and leave the tube in. B+ will go up so use 200V or 250V filter caps.

[HotBluePlates]

... B+ will go up so use 200V or 250V filter caps.

Which means buying a new can cap in that amp (in all likelihood). That can costs several times more than a new 35Z5. So it seems like it's "cheaper to keep her."

But maybe you needed new filters anyway. Will a new can rated for higher voltage (due to less diode drop) fit in the old space? Usually there's no room to spare on this type of amp.

[chuggy]

Can was replaced with individual caps that fit easily.
Got a NOS 35Z5 via ebay for $1.04, so diodes on hold.
Jim