[
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2007, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]
Welcome! Need support, you got it. Or share you ideas and experiences.
192.28.2.17
In Reply to: RE: Need Help With Ella posted by hi-fi_guru on July 24, 2007 at 15:41:09
hey,
i think brian offers great support for a diy product. he personally responds to questions with regularity. there are very few places in this industry with this kind of personal and community support. plus, its a great product to begin with.
i can attempt to help you trouble shoot the buzz problem as i am very familiar with the older model ella. i haven't noticed this myself, but this is always a possibility when you have a diy built amp. you will need to first figure out where the noise is being introduced. i don't think a grid stopper resistor will fix this problem; and the power tubes already have them, iirc.
btw, tube amps are not always going to be dead silent. if you can only hear this with putting your ear up to the speaker, i don't see that as a big problem. but i don't know the specifics with your setup.
Zarni...
Brian says the Ella should be dead quiet. The other one is dead quiet. All three are wired exactly - I mean exactly the same. You say it already has gridstoppers... Some have mentioned moving the resistors from the circuit board to the tube socket - are these the gridstoppers and is this a solution.
Anything that you can offer would be greatly appreciated!
Thanks in advance.
Sherf
By the way... I'm not at all sure that the chokes are mounted in the right position and wired correctly. At the time Brian recommended them and sold them to me, there were no instructions in the manual which also needed some revisions. I was sent two or three scans of drawings - all were different before I finall wired it according to the last sketch. So, if anyone can give me the actual correct connection of the chokes, it would be greatly appreciated.
Thanks in advance!
hi
sure..
grid stopper resistor : you are correct. these are mounted on the pcb originally with leads going to the power tube pins(1K?, exact value not super important). ideally, the resistors should be mounted as close as possible to the tube pin. so you could move the resistor to the pin and put a jumper on the pcb if you want. these would supress some tendency for oscillation at hf in the circuit. would not hurt, but i am doubtful that this is the problem.
the choke: i am not sure how to describe how this should be mounted as i don't have one in my ella.. but i can tell you how it should be connected from a circuit perspective. after the bridge rectifier there should be a capacitor (450V,220uf?) from HV to ground, then the choke should go in series from the + side of this cap. to another 450V,220uf cap. (+ side, - side to gnd). This point is then the B+ connection point (goes to circuit board and center tap of the output transformers).
let me know if you need clarification.
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2007, Audio Asylum, all rights reserved ]