Just a few watts into a 90dB sensitivity speaker should be more than ample for "normal" volumes. Maybe try for more than 10x gain with the two 100k resistors? 200k?
I think I asked if pre's could be stacked to do what I need much time ago.
It is why I tried to totally jack the value of R3/4. Then had to go back to stock for the measurment info that was asked for.
It is why I tried to totally jack the value of R3/4. Then had to go back to stock for the measurment info that was asked for.
I haven't followed this thread carefully, but wouldn't it be easier to change resistors again than add another pair of boards, if that's what you're asking? Besides that, 2 boards would be 100x gain (way too much) with stock gain Rs, as others have said. You'd clip badly.
Yes, I did that but had to cut that nonesense out because I needed to provied output V asap.
Now 105db is what is needed.
Id rather Lomcovk
In my case Correct.
I'm a bit hesitant to bring up anything cunning to solve this. I have to drag speakers around and try to hook them up before that attempt is made again.
You could add another preamp in series and turn the volume way down(!), at least for testing.
I wish you best health in your battle.
I wish you best health in your battle.
Let's combine all this nice posts and build a special around a T70 chassis, with an IO 360 engine (mounted flat to lower the CoG)... and a big propeller to cool whatever funny HIFI system inside the car fitted mainly to provide noise cancelling function 🙂)
Well well well... we hadn't that one back then... but we had at least a helicopter tubine powered sport car racing even at LM with as I could hear an interesting soundtrack
More seriously, good luck for your quest be it high efficiency LS or preamp with more gain
Claude
Well well well... we hadn't that one back then... but we had at least a helicopter tubine powered sport car racing even at LM with as I could hear an interesting soundtrack
More seriously, good luck for your quest be it high efficiency LS or preamp with more gain
Claude
You are a mind reader. Yes... I've spent much time rebuilding the pre's after going through this summer having them fail multiple times due to this 'house' wiring.
Made the Pass FE function finally and note then mention to forum It is not loud enough.
Now I've clutterd up this thread severly. And maybe the solution is to go back to where I was before I opended my mouth to solve this.
Bit late? Covered pretty much here. I'm not worried about solutions. I have many on shelf. I made an observation on FE 22 and MOFO combo. The problem is not universal and can die peacefully here.
Danke, H.
from my perspective, as I'm trying to be helpful, in many cases there is so much obstruction if problem is not promptly solved in "originating" thread
"obstruction" meaning that it is not easy to me to find necessary info re. specific issue, back in the thread
sorta solvable for one thread, but if I'm dealing on dayly basis with several threads, fatigue on my side is inevitable
that's the reason why I'm more often than not urging for separate thread
much more beneficiary than several threads around, popping just for overindulgence and ego-tripping of people doing nothing in the end ........
"obstruction" meaning that it is not easy to me to find necessary info re. specific issue, back in the thread
sorta solvable for one thread, but if I'm dealing on dayly basis with several threads, fatigue on my side is inevitable
that's the reason why I'm more often than not urging for separate thread
much more beneficiary than several threads around, popping just for overindulgence and ego-tripping of people doing nothing in the end ........
Yeah, you're right of course. Doh!daisy chain will give 10*10V/V gain
just a smidge too much
it's easier to change resistor or two, to get desired gain from Papa's FE
Hi,
I have 4 nos. of 2SK170GR with Idss from 5.1mA to 5.3mA and 4 nos. of 2SK170BL with Idss from 7.2mA to 7.4mA. Should I use GR or BL?
Thanks.
I have 4 nos. of 2SK170GR with Idss from 5.1mA to 5.3mA and 4 nos. of 2SK170BL with Idss from 7.2mA to 7.4mA. Should I use GR or BL?
Thanks.
Understand completely and why I rushed around to answer the questions instead of dealing with the solutions I had at hand.much more beneficiary than several threads around, popping just for overindulgence and ego-tripping of people doing nothing in the end ........
I made an obsevation and did not ask then for solutions. I was trying things and buttoning up the troubleshooting that was forced to be done here with the conditions I 'werk' under.
It was strongly suggested I take the advice and provide source V data that does not matter. It only in the end confirmed FE is not built incorrectly. Here I am right back to where I was days ago. If my doctors heard of what I am 'doing' they would kill me. I'm lectured on this all the time.
I made it a point to say I need time to provide the info or tests asked for. I easily could confirm empirically what was going on with legacy amps. I failed in that I did not provide the math on a subject I am not versed in. Or what speakers were used and what specs.
I can't solve this unless I have the pre's in a state they will not destruct again because they are severly jury-rigged.
I hesitate to bring up solutions and at this point will not even consider dealing with matching speakers to the amp. It is another waste of time. I will plod along and werk on my time.
If nothing else it shows It may be better to not bring up a subject on the forum.
Danke Zen
nope
it just teaches you, me and everybody else that sometimes you can't get systematically evaluated answer when cacophony is too great in Da Pub
but, OK, I can't force you, same as I'm not having brain enough to rummage back, to collect necessary facts
Dear Zen,
I hate to hurt your brain. It is a National Treasure.
One can always infer from Da Pub noise informaiton helpful. Same as it was in pure racing in period. Not today.
I miss the super Triad of 6L6, AndrewT and the Mighty Zen.
Did you know AndrewT built a race car?
Google this phrase -- Andrew Tymkewycz in the Tymtek at Fintry 1993
I believe his car, the "Tymtek" is No.54, with the long arm on the rear wing.
Google this phrase -- Andrew Tymkewycz in the Tymtek at Fintry 1993
I believe his car, the "Tymtek" is No.54, with the long arm on the rear wing.