UntilThen
Headphoneus Supremus
- Joined
- Jun 16, 2015
- Posts
- 26,926
- Likes
- 39,044
Don't know about 300B'a but TJ's aren't bad sounding either.Bald headed tubes. Not too bad looking.
Don't know about 300B'a but TJ's aren't bad sounding either.
Nope.What I wanted to do is to hear for myself a budget 300b tube and one that is supposedly pricey. I had to be satisfied that the megabucks that WE, Elrog or Takatsuki charges are worth it. Or is it just the consumer believing that anything that is expensive has to be much much much better.
Beautiful!!It's finally complete! Here's the push pull version of Odyssey!
It's setup as a power amp so no volume control. 6SL7/6SN7 driver tubes, cathode biased. Then you have adjustments galore for the output stage. The anode voltage can be set from 250V-400V. Then you set the negative grid bias for each output tube. The mA meters measures one tube at a time. Just flick the toggle switch towards the tube you want to measure. I included a 125mA fuse for each output tube just in case one should forget to adjust the bias.
As you can see the mains transformer is slightly pushed back. This is because we were having an issue with the Monolith mains and decided to replace it. And so to not have to rebuild the entire amp we pushed the new transformer back a little to cover up old mounting holes.
We also added extra banana jacks at the back panel. One set for the power tubes and one set for the driver tubes. This is for external heater power supplies. They are connected to the two big toggle switches on the top plate. Toggle up for internal 6.3V or down for external heating.
It can run both triode and ultra linear for the power tubes.
The switches on the front are impedance, 4/8 ohms, and output selector, speakers/headphones.
Best looking amp yet, and I love all those switches .It's finally complete! Here's the push pull version of Odyssey!
Yes, you have! It's this exact transformer cover I'll use on yours (and mine) Telemachus. It matches the Monolith's very nice!Another beautiful Ultrasonic Studio amp. It looks alright with the mains tranformer push back a bit. Now I have a glimpse of how Telemachus with those Monoliths transformer will look.
Beautiful!!
Thanks guys!Best looking amp yet, and I love all those switches .
Yes, you have! It's this exact transformer cover I'll use on yours (and mine) Telemachus. It matches the Monolith's very nice!
SQEEEEEE!!! It’s finally happening! Guess I should get the stand built and cables bought lol.It's finally complete! Here's the push pull version of Odyssey!
It's setup as a power amp so no volume control. 6SL7/6SN7 driver tubes, cathode biased. Then you have adjustments galore for the output stage. The anode voltage can be set from 250V-400V. Then you set the negative grid bias for each output tube. The mA meters measures one tube at a time. Just flick the toggle switch towards the tube you want to measure. I included a 125mA fuse for each output tube just in case one should forget to adjust the bias.
As you can see the mains transformer is slightly pushed back. This is because we were having an issue with the Monolith mains and decided to replace it. And so to not have to rebuild the entire amp we pushed the new transformer back a little to cover up old mounting holes.
We also added extra banana jacks at the back panel. One set for the power tubes and one set for the driver tubes. This is for external heater power supplies. They are connected to the two big toggle switches on the top plate. Toggle up for internal 6.3V or down for external heating.
It can run both triode and ultra linear for the power tubes.
The switches on the front are impedance, 4/8 ohms, and output selector, speakers/headphones.
I'm interested in how the amp will sound different due to the topology too.... I fully anticipate very different sounds because of the different topology and more power. Because I can now adjust the anode voltage and the bias current I also expect to be able to change the sound that way as well. Time to rediscover my tube collection!
There are ports for a meter next to each output tube. Set the bias and voltage (via the center meter), turn off the amp, wait 5 minutes, put in tubes, then turn on. That’s the way @SonicTrance wants it done. Once the tubes are warm check the bias meters and correct as needed.I'm interested in how the amp will sound different due to the topology too.
How do you set the negative grid bias on the amp?
I had originally asked for a simple 6v/12v switch for both input and output tubes. Spending too much time on the internet, and money, let me to looking at other voltage tubes. I own 11n7 and 16gk6 tubes. I have also started to look into the world of old British 4v tubes. Having external supplies is the easiest way to have the most flexibility.The feature with input ports for the heater voltage supply is really neat! Those monolith transformers really do live up to their name.