The low hum is from both sides or single side?
Have you tried other tubes?
Yep both sides. And I've tried numerous tubes.
The low hum is from both sides or single side?
Have you tried other tubes?
Sorry to change the subject from the noise issue, I'm sure it's frustrating, but I was wondering if anyone has had some experience with trying out tube types that are not specifically mentioned in the specs. In this thread we talked already about the 5755, which I wouldn't know or trust without knowing the recommendation came from the amp designer himself (and it's one of my faves!). I've since been reading about other tubes that could be compatible, but not having much experience with tube amps, I'm unsure of what could happen. Specifically, has anyone tried a pair of 6094 (apparently EL84-ish, but needs an adapter) or a 12BH7? Is there a way to tell if they are compatible, and how much damage can I do if I plug in a tube that the amp doesn't like?
[/Qtunes.
Yeah the 5755, Justin told me over the phone that was his favorite for the Pendant. I trust his judgment as the designer/maker. And sorry, don't have any experience with the other types you mentioned.
Some other suggestions:
Try the amp in your neighbors house to see if it's the ground loop hum (dirty power).
Fasten all the screws on the transformers.
Use a transformer cage like this:
https://www.radfordrevival.co.uk/spares-services/transformer-cages/
ZMF headphones hand-crafts wood headphones in Chicago, USA with special attention to exceptional sound and craftsmanship.
Stay updated on ZMFheadphones at their sponsor profile on Head-Fi.
|
How hot do your EL84s/power output tubes get in your Pendants?
My input tube only gets mildly hot...but my powe output tubes get scorching. Probably hotter than any other tube gear I've had.
I got burned once touching those, so I'm guessing that's normal. The rectifier tube gets pretty hot too.
Use a transformer cage like this:
Do you use the JJ ECC99 in place of EL84s? I’m not familiar with that tube, and online descriptions make it sound like it can be used anywhere depending on the application. Thanks for the input!Hey Folks. Few tid bits... All tubes get to enough to burn off your finger prints... completely normal and why I dont have sensation in 2 fingers.
All of our power transformers are spec'd as 120V or 230V accordingly and all include shields.
There are alot of factors that influence noise floor for which Zach listed the many.
System matching is super important with any tube amp with the Pendant included.
The Pendant was conceived as a dual purpose amp, quiet enough for high efficiency headphones and powerful enough for planers.
Using the low z will likely provide the lowest noise floor and most base grip whereas the High Z will give a lighter/more dynamic sound.
If noise is a principal concern, the low z is the very best chose.
One last thing.... I love JJ ECC99s on the Pendant... I also enjoy Japanese Mullard 12AU7s.
Do you use the JJ ECC99 in place of EL84s? I’m not familiar with that tube, and online descriptions make it sound like it can be used anywhere depending on the application. Thanks for the input!
Hey Folks. Few tid bits... All tubes get to enough to burn off your finger prints... completely normal and why I dont have sensation in 2 fingers.
All of our power transformers are spec'd as 120V or 230V accordingly and all include shields.
There are alot of factors that influence noise floor for which Zach listed the many.
System matching is super important with any tube amp with the Pendant included.
The Pendant was conceived as a dual purpose amp, quiet enough for high efficiency headphones and powerful enough for planers.
Using the low z will likely provide the lowest noise floor and most base grip whereas the High Z will give a lighter/more dynamic sound.
If noise is a principal concern, the low z is the very best chose.
One last thing.... I love JJ ECC99s on the Pendant... I also enjoy Japanese Mullard 12AU7s.
We have tried without issue but can’t recommend formally yet. Need to do a bit more testing. The Mullard 12au7 that was made in Japan is remarkable as well.