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In Reply to: RE: Paraglow 2a3 SET posted by audiophilewannabe on January 29, 2017 at 06:36:13
Yes, came with all magnequest iron
Replaced by Paramount
Thanks .... are they auto bias? Do I need to do anything if I tube roll? What's a good set of 2a3 tubes for these amps... it came with sovtek and it seems be be very good, but would like to try other makes.
At least, not in the normal meaning of the phrase. They are direct coupled.
so, no cathode resistor?
I believe there is a cathode resistor and a large value one at that.
The current through the output tube creates more voltage at the cathode than there is at the grid.
The grid is connected to the plate of the driver tube so, in the end, it's a combination of the driver tube's plate voltage and the voltage created by the output tube's current flowing through its cathode resistor that "biases" the output tube.
Have Fun and Enjoy the Music
"Still Working the Problem"
No adjustment. There is a lot of debate about the "best" 2A3. Most of the popular current production tubes are listed on the URL below. Ones that are not there, namely 3 different types of Emission Labs (EML) 2A3 tubes , can be found at JAC music.
You really should search or ask the tube question on the Bottlehead forum.
Frihed is correct that you will get better answers on the BottleHead forum under "Legacy Products" from the designers. There were a couple of variations...what is your driver tube?
It is direct-coupled with a strong turn-on. Not all my old stock tubes liked it, but coil spring Sylvania did well. New production tube didn't seem to have a problem. EML tubes weren't recommended. Again, BottleHead is the best place for accurate answers.
OPTs were EXO-035 or 036...one is 8 ohm, the other 16 ohm(I forget which are which, but they are nickel )
Good amps worth using!
I'll go to BottleHead forum. Since I'm already here I'll continue on. The driver tubes are 5965..does that make sense?? According to the fellow I got it from the Kit was assembled by "Tube Guru", I don't really know who they are, I suppose he is saying that it was professionally put together. Because its a direct coupled, they installed a standby switch, works like a mute..I really like what I hear so far. I'm currently using a Yamamoto A08S and they are very close, I'm actually leaning towards the 2A3. That being said I need to hear them more.
The 5965 was used in the original Paraglow kit.
They would need to know that to help you at BottleHead.
The EXO-36 are 16 ohm secondary
The EXO-35 are 8 ohm
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