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Re: HiFi tube amp and homebrew guitar preamp
Posted: Wed Nov 18, 2020 2:24 am
by espidog
I see that the Seeburg amp offers a choice between cathode-biased and fixed biasing. Nice touch.
Re: HiFi tube amp and homebrew guitar preamp
Posted: Thu Dec 31, 2020 4:44 pm
by Dom
Hey Tube_Fan John, do you have any experience running an l-pad between the amp and the speaker to get a saturated sound at lower volumes? Cheap enough to build but for the life of me I can’t find a decent a-b test to see the efficacy. I’m looking at slapping one together for my 24w Supro and one for an Orange AD30.
Re: HiFi tube amp and homebrew guitar preamp
Posted: Tue Jan 05, 2021 3:08 pm
by Tube_Fan
I never used an Ipad. I have some laptops. I have one connected to a Lepai amp and some speakers via the head phone jack.
Re: HiFi tube amp and homebrew guitar preamp
Posted: Sat Jan 09, 2021 2:43 pm
by Dom
D’oh! I should have used a capital L. An L pad is a simple attenuator that shunts a certain amount of signal as heat. I’ve never had a chance to use an attenuator on anything myself. And sorry for the thread jack!
Re: HiFi tube amp and homebrew guitar preamp
Posted: Sun Jan 10, 2021 11:05 am
by Tube_Fan
LPAD. I've used those with midrange speakers and tweeters. I never used them with a guitar amp.
Here's a 100W LPAD.
https://www.parts-express.com/parts-exp ... m--260-262
Re: HiFi tube amp and homebrew guitar preamp
Posted: Sun Jan 10, 2021 11:33 am
by jps
I have one of those around here somewhere, brand new in the box, someone could have.
Re: HiFi tube amp and homebrew guitar preamp
Posted: Fri Dec 31, 2021 10:02 am
by Kiddwad57
jps wrote:Kiddwad57 wrote:I've had to teach students how to turn on a silverface Bassman!
I can see it, now. Someone getting into a car for the first time to learn how to drive.
N@@ß: Hey, how do ya' boot this thing up?
My wife bought a new car. It's really like that!
Re: HiFi tube amp and homebrew guitar preamp
Posted: Fri Dec 31, 2021 12:11 pm
by jps
Kiddwad57 wrote:jps wrote:Kiddwad57 wrote:I've had to teach students how to turn on a silverface Bassman!
I can see it, now. Someone getting into a car for the first time to learn how to drive.
N@@ß: Hey, how do ya' boot this thing up?
My wife bought a new car. It's really like that!
We are on the verge of buying a new 2022 model year car. Scary, all the "Save You From Yourself" technology in these things, now. And, not even a real, reliable mechanical parking brake; they are electric with a small switch and motors (I'm sure there is software involved, too) to clamp down on the rear brakes. Just because they can do something, doesn't mean they should. I guess the car companies have a whole lot of IT and software engineers on the payroll that has to do something to justify their jobs. I have read about software/firmware updates that occur automatically that may actually disable the car due to bugs or unsuccessful downloads.
Re: HiFi tube amp and homebrew guitar preamp
Posted: Fri Dec 31, 2021 2:16 pm
by Kiddwad57
I love my ‘07 Focus wagon
Re: HiFi tube amp and homebrew guitar preamp
Posted: Mon Jan 31, 2022 5:03 pm
by Tube_Fan
An Introduction to Scientific Guitar Design
By Donald Brosnac
https://books.google.com/books?id=oejZD ... ar&f=false
Re: HiFi tube amp and homebrew guitar preamp
Posted: Thu Jun 08, 2023 8:13 pm
by Tube_Fan