Leslie 21h current limiting light bulb

[Jamfu]

Hey all,
This is my first post and I'm a newbie to electronic projects. I picked up a 21h and am going through the amp to be able to play it. I plan to make a new cabinet for it and keep it for many years. Ihave all the replacement caps and resistors, new tubes etc.. and I am ready to begin.. I made a current limiting bulb and tried it out. The bulb lit up bright the first time I fired the amp up . So I looked inside.. the sheathing on the wires coming from the big power transformer were disintegrating and thus causing a short for sure.. I took the transformer apart, put shrink tubing on the degraded wires. And checked all the resistances .. everything looked a-ok no more shorts and all the windings gave what I expected..I put the transformer back in and fired it up with my 300w bulb in the circuit.. it's still on but not as bright. My question.. with these old amps will there always be enough current draw to light a bulb? Or did I just find one short in possibly a handfull of shorts? This is my first amp project so I have no experience for the feel of what it should look like. Any insights are appreciated

[Jyvoipabo]

If you have put a limitation lamp in series you are no longer a beginner.
Some tubes consume a lot for their own needs.
5V 2A for heating a 5Y3 which makes 20W just for these 2 lamps.
It may be normal that the limitation lamp lit.

Try the amp without any tubes. The limitation lamp must not light up.

Plug the 5Y3 and check the high voltage ~ 400V

Then the 6SN7 and check 110 ~ 120V on the anodes.

Connect a speaker and plug the 6V6.
If the limitation lamp turns red everything is normal.

You can then short it and check 19V on the 6V6 cathodes.

JP

[Jamfu]

Got 374.8v to the rectifier tube sockets. Light is not illuminating :P. That Makes me happy.

[Jamfu]

Got 175v at the 6sn7s. Seems a little high to me

[Jyvoipabo]

Hello,

This amplifier is made for Loudspeaker with field coil.
Shematics indicate 2650 Ohm Field resistor.
If you don't use this kind of speaker, you must have to simulate the coil by a resistor.
Value 2700 Ohm, Power = (295-19)²/2700 = 28W minimum
..or modify the design.
JP