Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jordan86 on August 22, 2020, 04:28:06 pm
-
I’ve somewhat picked up that this is not necessary? Would like to confirm. I’ve also read that twisting the OT primarily leads can cause a loss of high end. I think I read that on a Hiwatt related thread? Just wanted to confirm specifically and definitively.
What do you guys do? I have a Princeton with an Allen TO20B. It supposedly is a bit more hi-fi than the TO20 but I would say my amp is pretty warm. I run the treble at around 7-8. Wondering if this is a byproduct of me twisting the OT leads?
Wanted to inquire before I break out the soldering iron.
Thanks!
-
No twists for me.
-
> I’ve also read that twisting the OT primarily leads can cause a loss of high end.
10k impedance, 30pFd per foot, 1 foot leads: 555kHz. Low AM band, far-far-far above audio band.
Twisting "may" reduce radiated audio and unwanted sneak-back to small-signal stages.
-
To me, where feasible, it seems good practice to twist wires that are in close proximity and which are carrying balanced signals. Especially so when, as with those to power tube plates, they’ll have significant electric field associated, which may be best being mitigated by a bit of twisting, rather than being allowed to propagate throughout the chassis.
Generally though, given a typical chassis layout with the OT in reasonable proximity to the power tubes, the wires to the power tube plates will be fairly short and being twisted or not won't make any (easily) measurable difference.
-
Twist if it makes you feel good.
Usually, my amps' OT wires have such a short run from the grommet-hole to tube-socket that there's no room to twist anything. And usually, the hole is somewhere between the tube sockets so wires go <---- O ---->.