Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pc1093 on December 19, 2021, 11:39:55 pm
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Hi all,
I would want to use a 5Z4 as a rectifier.
1. Does the first Reservoir Capacitor need to change 4.7uF/450V ?
2. need I add a resistor before the chock? how much is it?
3. Does any other resistor value need to change?
thank you
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Someone much more knowledgeable will chime in but......
Those cap values arent common to tube rectification.....I would guess the first would be 47uf our something close.....
And you will need a transformer with a 5v winding to run the 5Z4....
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Someone much more knowledgeable will chime in but......
Those cap values arent common to tube rectification.....I would guess the first would be 47uf our something close.....
And you will need a transformer with a 5v winding to run the 5Z4....
https://www.radiomuseum.org/tubes/tube_5z4.html (https://www.radiomuseum.org/tubes/tube_5z4.html)
I find that the first Reservoir Capacitor max is 40uF.
I have another 5V transformer to supply the heater.
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Someone much more knowledgeable will chime in but......
Those cap values arent common to tube rectification.....I would guess the first would be 47uf our something close.....
And you will need a transformer with a 5v winding to run the 5Z4....
https://www.radiomuseum.org/tubes/tube_5z4.html (https://www.radiomuseum.org/tubes/tube_5z4.html)
I find that the first Reservoir Capacitor max is 40uF.
I have another 5V transformer to supply the heater.
Is there a reason you want a 5v rectifier? Why not a 6v rectifier and save the space.
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I would want to use a 5Z4 as a rectifier.
Why? What do you expect to gain? I see zero benefits of using a tube rectifier in a tube preamp.
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I would want to use a 5Z4 as a rectifier.
Why? What do you expect to gain? I see zero benefits of using a tube rectifier in a tube preamp.
I just find a tube rectifier easy to buy.
now I find 6X4/6X5 more suitable for this.
If I use 6X5, how can i change the first Reservoir Capacitor?
For the B+ supply need 150V, what value of the resistor before 0D3 need?
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If I use 6X5, how can i change the first Reservoir Capacitor?
For the B+ supply need 150V, what value of the resistor before 0D3 need?
The tube chart you posted said to use a 32µF reservoir cap. I would also change the other filter caps to 32µF.
A 10K resistor should work fine for the OD3, although a single 10K 10W would be sufficient. The resistor has to drop 210V so it will actually dissipate 4.41 watts.