I know this may seem like an ignorant question, but I really don't know:( I just replaced all the pre-amp tubes & rectifier tube in my 6545 and totally forgot to get a balanced tube for the PI. Here is what I ended up with:
V1: Tung Sol 12ax7 (New reissue) V2: Tung Sol 12ax7 V3: NOS RFT EF86 V4: Tung Sol 12ax7 V5 & 6 Power Tubes: Stock GT-E34LS V7: JJ / Tesla GZ34 / 5AR4
I will say, the Tung Sol's really sound great. Very punchy, tight & touch sensitive. I was concerned about all the issue's with the 12ax7m's & went with these instead. I forgot & did not order a balanced one for V4, but the amp sounds so much better? Will this hurt anything? Also, I picked up the RFT NOS EF86 (W. Germany branded AMC) as it was affordable over the other NOS EF86's out there and this sucker really pulled the wet rag off the 45 side! I now have bigger bottom end, sweeter mids & a really lush top end. sort of more crunchy...I got so excited over how much of a difference a NOS EF86's made over the stock one, I just ordered a NOS Mullard as well as a NOS Telefunken! So much for saving money! The RFT sounds amazing though...
Post by bustertheboy on Apr 22, 2006 2:06:20 GMT -7
a balanced PI is important because each tube gets equal signal in tube amps (except true class A- which are very unusual- not ac30's 15's matchless etc- not true class a) the balance lets each tube get equal signal- or near the tubes act in push pull- the signal is quickly moving from one tube to another- with balance pi you should get more even frequency response- less flat spots am i right? please correct me if not
Strat, Teles, a couple of hollow bodies, lap steel, various resonators
Carmen Ghia head
1x12 cab EV12L
212 cab Red Fang/WGS v30 clone
Lots of pedals, lots of changes
Since Myles hasnt responded, I'll take a stab at this... A 12A** style tube is a "two sided" tube...or like 2 tubes in one...I forget the correct terminology for it. Anyway, in the preamp stages, only one side of the tube is used so no need for matching. In the Phase Inverter spot, both sides of the tube are used so having both sides of the tube matched leads to more consistent/better tone.
Thanks to all for the info! I now have a really silly question...I ordered a balanced Tung Sol 12ax7, which should arrive in the next few days. Can someone be kind enough to tell me which spot is V4 (PI) on a 6545 if i'm looking at the back of the amp? Thanks!
easyed: Call any vegetable - call it by name! And the chances are good, that the vegetable will respond to you. F-Zappa.
Oct 1, 2019 19:49:10 GMT -7
The Bad Poodle: rutabay-ayga... rutabay-ayga
Oct 2, 2019 12:33:25 GMT -7
"Z" Steve: I'm losing status at the high school - I used to think that is was MY school
Oct 8, 2019 15:01:34 GMT -7
The Bad Poodle: A bunch of pom-pom girls, Looked down their nose at me. They had painted tons of posters, I had painted three. I hear the secret whispers Everywhere I go, My school spirit is at an All time low...
Oct 8, 2019 17:11:32 GMT -7
"Z" Steve: Oh Look! My hair is getting good in the back!
Oct 10, 2019 20:48:05 GMT -7
GuitarZ: Argghh! ETA for power is Sunday midnight. Thank you for giving us all a place to vent. At least we have a generator and our house suffered zero damage from the storms.
Nov 1, 2019 13:25:37 GMT -7
Ed M.: Yup generator is humming along.....
Nov 1, 2019 13:45:12 GMT -7
GuitarZ: Yea! Our power's back on. They beat their estimate by two days! Yea!!!!!! Let's hope you're right behind Ed M.
Nov 1, 2019 18:15:14 GMT -7
roscoenyc: Almost every piece of gear I have except for my tuner has at least one knob. Those are for adjusting. PSA for the "too much bass" crowd.
Nov 14, 2019 9:10:34 GMT -7
The Bad Poodle: cause we all know Too much bass increases "tube rattle"....
Nov 14, 2019 11:23:20 GMT -7
roscoenyc: Oh my goodness!!!
Nov 14, 2019 11:24:11 GMT -7