36 watt transformer specs

[martyfriedman86]

Hi everyone!

i'd like to know if someone could give me specifications for the PT, OT and choke for a 36 watt tmb so I have someone do them for me, cause importing them is kind of expensive (i'm from argentina).

btw
should i have any consideration if I bouild this using semiconductor diodes (tube rectifiers are hard to get here and quite expensive)

thansk a lot!

[sub]

I'm curious also.
What i know (i'm not expert):
OT: about 30-50W 4Kohm primary impedance.
PT: 290-0-290 secondary (mA: 18W PT is about 120mA i think 36W little higher.... i hope anybody post the correct spec.)
If you want using diodes, you can use sag resistor (after diodes) or lower secondary voltage PT.
Sorry that's all what i know

[leslie]

Data sheets under Ia(I anode),typical operation:
one El 84 draws 48mA
one ECC83 draws 1,2mA
One EF 86 draws 3mA

when you calculate all tubes you have HT minimum rating.

Now you calculate heaters winding ,they are in tube data sheets under If(I fillament)....
Calculate for all tubes,but separately for rectifier tube/winding.
This also you can see if someone already have this transformer in transformer info..like ceriatone or heyboer...3,4-5k OT for 4xel84 is ok
If it's rated 35 or+watts.

[sub]

Data sheets under Ia(I anode),typical operation:
one El 84 draws 48mA
one ECC83 draws 1,2mA
One EF 86 draws 3mA

when you calculate all tubes you have HT minimum rating.

Now you calculate heaters winding ,they are in tube data sheets under If(I fillament)....
Calculate for all tubes,but separately for rectifier tube/winding.
This also you can see if someone already have this transformer in transformer info..like ceriatone or heyboer...3,4-5k OT for 4xel84 is ok
If it's rated 35 or+watts.

...... and thanks your patience

[martyfriedman86]

Thanks that useful for the OT
but i need specifications for a PT suitable for semiconductor diodes.
final rectified voltage is defferent if you use a tube rectifier or if you use semiconductor diodes.

i'd like to have the same voltage as the schematic's voltage chart using diodes

[Merlinb]

Thanks that useful for the OT
but i need specifications for a PT suitable for semiconductor diodes.
final rectified voltage is defferent if you use a tube rectifier or if you use semiconductor diodes.

PT: 270 to 280V, at 170mA minimum.
6.3V at 4.5A minimum.

OT: 36W rated,
Primary impedance: 4k a-a,
Primary inductance: 20 Henry minimum (30H or more is preferred).