Which amps use KT66 tubes?
Very well known amps were designed with KT66 tube. For example, legendary LEAK Quad II and Heath W5M use KT66 tube in Williamson circuit. And of course, the Marshall JTM45 and its derivative models 1961 and 1962 used the KT66 tubes.
Do you have to bias el34 tubes?
Conclusion: You’ll need to bias most tube amps if you change the tubes. This is because you cannot buy tubes with a similarly matched resistance. You should always buy a matched pair or a matched quad of tubes, but the chances of them matching your current pair are very small.
How do you adjust cathode bias?
If your amplifier is cathode biased you must replace the cathode resistor to change the bias level. A higher value cathode resistor will cool the bias, a lower value will warm the bias. Cathode biased amps can safely run at 100% plate dissipation at idle.
Is Princeton Reverb cathode biased?
The first is grid biasing, and that’s the way the Princeton Reverb is configured. Setting the bias actually means fixing the negative grid voltage, and it’s done using a fixed or variable resistor. This biasing method is known as ‘fixed bias’ and the valve’s cathode is connected directly to ground.
Can KT77 replace EL34?
The quick answer to the difference between EL34 vs 6CA7 or EL34 vs KT77 is simple. EL34, 6CA7 and KT77 are all drop-in replacement of each other. You can use 6CA7 or KT77 in place of EL34. Electrically, they are the same.
Who used Marshall JTM45?
Peter Green
That’s the case with this month’s featured amp: a 1964 Marshall JTM45 4×10 combo that was owned and played by Peter Green during his years with Fleetwood Mac, and potentially with John Mayall’s Bluesbreakers. It is a beast!
Do you need to bias preamp tubes?
With preamp tubes, you don’t need to worry about things like biasing or using matched pairs as you do with power tubes. As long as your new tube is the same model as what you’re replacing (12AX7, 12AT7, 6SN7, etc.), you’re good.
Can I use 6l6 instead of EL34?
Assuming you have 1k screens and your sockets are wired for El34s like in a typical marshall yes you can run 6L6s. I can run 6l6, 6v6 El34 and KT88s successfully in my 50w plexi. All you have to do is check the bias.
What tubes are in a Fender Princeton Reverb?
Tubes for the Fender 65 Princeton Reverb Reissue
- × 1. 12AT7. Vacuum Tube – 12AT7 / ECC81, Electro-Harmonix. Vacuum Tube – 12AT7WC, Electro-Harmonix.
- × 1. 5AR4. Vacuum Tube – 5AR4, Chinese. Vacuum Tube – 5AR4 / GZ34 / U77, Genalex Gold Lion.
- × 2. 6V6. Vacuum Tube – 6V6GT, Electro-Harmonix – Apex Matched Pair.