Tube Amp Archive

Ok...

The 2M2 resistor had drifted but the 820 was good.

Now the V3 pin 8 voltage is 86 and pin 6 is 91.

Pin 6 on V1 is unchanged.

???

Ok,

V3B: pin 6 - 222V, pin 7 - 162V, pin 8 - 162V

The Voltage for A (after the dropping resistor that sits atop the cap can): 219V

The voltage on the supply side of the V1 plates is right there (217-218.5)

pretty curious voltage on V3B cathode?

Ok... back at the bench. first of all, by now I have swapped out just about every coupling cap in the preamp. Next, I did go back to the original resistor values for the cathode on V1. The voltages in question: V1: pin 1 - 46V, pin 3 - 0.57V, pin 6 - 77V, pin 8 - 0V V3: pin 1 - 46V, pin 3 - .001V, p...

So... I get around .6 on the cathode (pin 3). I experimented with cathode resistors until I got the voltages that I wanted. Now my plates are very much in the ballpark, but the volume is still very weak from that channel. I sprayed buckets of zero residue cleaner in and around the socket (I heard ho...

As far as the model number-- I don't really know for sure. It is an Estey-made Titano Model 383. I was told it was a 280, so that's all I know. It seems to be pretty consistent with the 280B schematic that I found: I'm also including a hand drawn layout that I found on the web somewhere (it is easie...

Still working...

Here are some pics. Careful what you ask for!

Come on guys! Swapping a tube is ALWAYS the 4th thing I do! After I take 3 unnecessary steps, then remember to swap the tube. (Remembering to plug it in comes in somewhere around step 8) Anyway, I have a good tube in there. As for maiden voyage-- I didn't realize it was my first post here. Wow. I ha...

Oh knowledgable ones: I'm working on a Magnatone 280. channel 2 is working fine. Channel 1 is a belligerent $%&*@$. Schematic says i want 120V on pin 1 and 130V on pin 6 (V1). i have 170 on pin 1 and 88 on pin 6. I have 258V in front of the plate resistor (on pin 6) and I swapped the plate resistor ...