That's one of my favorite subjects. Since your email is listed I'll send you some information.
I first used 5676's as replacement for WD11's. A 5676 draws 120 ma filament current while WD11 draws 250 ma. Resistor should be added across the filament to increase current. Radiola III and other radios, using WD11, control volume by adjust filament current. If filament current is very low the rheostat won't have proper action.
You can use a 5676 for making 01A's but there are a couple problems. The 5676 won't fit between base and glass of an 01A. An 01A operates on 5 volts. To operate on the same voltage you need to add a series resistor. Grain of wheat lamp make it look like a filament glowing.
I found a 958A will fit between the glass and base of an 01A with a little modification. Break of vacuum stem and drill a small hole in center of the bakelite base for 958A exhaust tip.
It's also a good idea to use a bridge rectifier with the filament. This will cause the tube to operate properly regardless of filament polarity. I'll explain later.
Norm
:I know this isn't really a new topic, but it's been awhile since the rebasing tubes subject was going. I have two defunct WD-11's and some dead 01A's that I think I can put the 5676 tubes in. I've read that a 22ohm 1/2 watt resistor is to be connected parallel with the filament on the WD-11 and the same resistor in series on the 01A with a grain of wheat bulb. Is this correct? Also, has anyone had success in opening up the glass in the bottom? I'm working with loose based tubes, so my glass is going to be more of a problem. Thanks, Herman
I've sent both of you information and pictures of subs.
Norm
:
Norm,
:This is something new to me. I would be greatly interested in this info if you wouldn't mind sending it to me also. Many thanks,
:Steve
:Hi Herman
:
: That's one of my favorite subjects. Since your email is listed I'll send you some information.
:
: I first used 5676's as replacement for WD11's. A 5676 draws 120 ma filament current while WD11 draws 250 ma. Resistor should be added across the filament to increase current. Radiola III and other radios, using WD11, control volume by adjust filament current. If filament current is very low the rheostat won't have proper action.
:
: You can use a 5676 for making 01A's but there are a couple problems. The 5676 won't fit between base and glass of an 01A. An 01A operates on 5 volts. To operate on the same voltage you need to add a series resistor. Grain of wheat lamp make it look like a filament glowing.
:
: I found a 958A will fit between the glass and base of an 01A with a little modification. Break of vacuum stem and drill a small hole in center of the bakelite base for 958A exhaust tip.
:
: It's also a good idea to use a bridge rectifier with the filament. This will cause the tube to operate properly regardless of filament polarity. I'll explain later.
:
:Norm
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:
:
:
:
::I know this isn't really a new topic, but it's been awhile since the rebasing tubes subject was going. I have two defunct WD-11's and some dead 01A's that I think I can put the 5676 tubes in. I've read that a 22ohm 1/2 watt resistor is to be connected parallel with the filament on the WD-11 and the same resistor in series on the 01A with a grain of wheat bulb. Is this correct? Also, has anyone had success in opening up the glass in the bottom? I'm working with loose based tubes, so my glass is going to be more of a problem. Thanks, Herman
Just to add to this--I finished one WD11 with 5676 and resistor today. The glass on the original tipped tube was saved, but it was a pain in the glass to do it. Stick the resistor leads down in the tube base pins with the new tube leads and solder top and bottom if you're going to try this. One more to go, then out comes the Radiola 111 when I get the battery eliminator working again. Oh and be ready for the POP when you open up the bottom of the tube. Herman
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::Hi Herman
::
:: That's one of my favorite subjects. Since your email is listed I'll send you some information.
::
:: I first used 5676's as replacement for WD11's. A 5676 draws 120 ma filament current while WD11 draws 250 ma. Resistor should be added across the filament to increase current. Radiola III and other radios, using WD11, control volume by adjust filament current. If filament current is very low the rheostat won't have proper action.
::
:: You can use a 5676 for making 01A's but there are a couple problems. The 5676 won't fit between base and glass of an 01A. An 01A operates on 5 volts. To operate on the same voltage you need to add a series resistor. Grain of wheat lamp make it look like a filament glowing.
::
:: I found a 958A will fit between the glass and base of an 01A with a little modification. Break of vacuum stem and drill a small hole in center of the bakelite base for 958A exhaust tip.
::
:: It's also a good idea to use a bridge rectifier with the filament. This will cause the tube to operate properly regardless of filament polarity. I'll explain later.
::
::Norm
::
::
::
::
::
:::I know this isn't really a new topic, but it's been awhile since the rebasing tubes subject was going. I have two defunct WD-11's and some dead 01A's that I think I can put the 5676 tubes in. I've read that a 22ohm 1/2 watt resistor is to be connected parallel with the filament on the WD-11 and the same resistor in series on the 01A with a grain of wheat bulb. Is this correct? Also, has anyone had success in opening up the glass in the bottom? I'm working with loose based tubes, so my glass is going to be more of a problem. Thanks, Herman
you can cut the tube off at the base after removing the bakelite base with a dremel and one of those diamond cut off wheels from harbor freight you have to keep water dribbling on the tube as you cut it.i did this with aq 6d6 and put a 6ba6 inside it[IMG]http://i4.photobucket.com/albums/y127/hyprion/IMG_0009.jpg[/IMG].butch