crate paloino 50 impedance , how to determine?

[georage]

Alright Jon Snell. I have all the tools to run that experiment, and thanks for the math G1. to answer your questions Helmholz, the amp has 4 el84s. I dont have a schematic but I have a v50 schematic with four unlabeled power tubes. it looks close. Idk the B
+ yet and the power rating is probably 50. it will take me some days but i will run the experiment. thanks.

[Jon Snell]

Alright Jon Snell. I have all the tools to run that experiment, and thanks for the math G1. to answer your questions Helmholz, the amp has 4 el84s. I dont have a schematic but I have a v50 schematic with four unlabeled power tubes. it looks close. Idk the B
+ yet and the power rating is probably 50. it will take me some days but i will run the experiment. thanks.

Four EL84s, British Nine pin Noval base, will struggle to give more than 36 Watts.
I suspect it will have EL34s in there, bigger bottle, International Octal base.
Have another look.

[g1]

I haven't see a schematic for the 4 x EL84 version. The V32 schematic has that set-up and schematic might be similar.
The EL34 version only has 2 power tubes.

[g1]

I have a v50 schematic with four unlabeled power tubes. it looks close.

Please post it.

[eschertron]

My palamino V50 schematic shows 4 power tubes, two of which are optional and are for a 100W amp. EL34s.
crate V50 212.pdf

[georage]

yep thats the one i have

[georage]

it deffinitely has 4 el84s in it and 3 12ax7s. whether those are the right tumlbes or not is a mystery. i couldnt get a good pic...but i will attempt to upload the pics from the experiment. ive never uploaded and pic and have no idea how, same with the schematic. eschertron has me covered though. thank you.

[georage]

ok so i ran an input signal of 360mv at 1khz into the amp on the clean with eq at about 3oclock. i set the dummy load to 8ohms and raised the volume to 8volts peak to peak. i no longer touched the amp and recorded the pkpk volts when the load resistance was changed to 8,16,4r.
results: 8r-8.32v, 16r-14.4v, 4r-4.6v.

[georage]

using the formula ((pkpkV÷2.8)÷r)x(pkpkV÷2.8)=W
i got 8v÷2.8=2.97vrms, 2.97v÷8ohms=.37amps
.37 x 2.97 = 1watt

and so 8ohms, 1w
16ohms, 1.6w
4ohms, .6 w

[georage]

i took some pics when each load went into clipping, however they dont make any sense. instead of clipping the signal started going crazy and the volume level wasnt controlled i just turnes it up until the signal went crazy for each load impedance and snapped a shot. the ot was really making noise and "singing" when the volume went up. and i didnt have to turn it up past 5.

[georage]

this is the board with the 9 pin sockets

[georage]

you can see that some caps have been moved off the board via some jumper wires and the wire nuts are a diy mains-tap.

[Helmholtz]

So the amp likes to oscillate at around 10kHz.

We need the correct schematic for the EL84 version.

[georage]

hopefully this works. this schematic looks to be the right one. it has the exact part number of the ot. however the b+ is 341 instead of 320

[Helmholtz]

Yes, that schematic looks correct:4xEL84, cathode bias, 8 Ohm output, 32W. (no global NFB), quite similar to a Vox AC30.
It is great that the schematic gives test voltages.
So your amp is actually a V32.

First find R22 (60R/10W) and measure the DCV across it.