6L6 SE OT

[spoontex]

Hi,


I can use 4200R instead 3500R with this circuit?


DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier


And why they said 15W? The 6L6 only out's 6W in SE.


Thanks.

 

[maton00]

The 15W figure you are referring is the nominal standard or recommended nominal power for the transformer, the circuit will develop lower power output with 4.2k vs 3.5k also the distortion wil be lower, also is known that bigger OPTs will have higher possibility to reach lower distortion vs a smaller one in the low end, also thats because they (a bigger OPT will have more average magnetic headroom vs a same smaller OPT) of course only if speaking about the same ratios and same overall type and construction 3.5K 10W vs a 3.5k 15W

 

[duncan2]

Actually Mullard give their 6L6 a load of what you posted -- RL ( load ) of 4200 ohms for an output of 11 watts (rms )

at a plate Voltage of 350 volts DC --screen 250 volts -- grid minus 18 volts -- plate current 54ma .


Be aware those figures can vary Tungram has a RL of 4500 ohms and slightly different plate & screen voltages .
Plate voltages do make a difference to the output .


I always go by Mullard as that is the UK prestige ( or was ) tube company .
In the USA it will be RCA I am talking about ORIGINAL tubes -IE- NOS what tube companies come up with nowadays might be different.

 

[jhstewart9]

Pushed very hard that circuit with a 6L6GC might make 3W of audio. While dissipating 20W, it is triode connected. Refer to the data sheet.🙂

 

[spoontex]

Yes,


it's will be my first HIFI tube amp. So, I don't know if it worth and how it will sound...


I chose this one, because it's relative simple.

 

[Ketje]

Pushed very hard that circuit with a 6L6GC might make 3W of audio. While dissipating 20W, it is triode connected. Refer to the data sheet.🙂

That's about it.B+ 350V and bias 50mA.
Mona

 

[duncan2]

Missed the resistor connecting the screen to the anode ---yes that will reduce the wattage.