push pull tube amplifer
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60 Watt Audio Power Amplifier
Circuit topology is about the same of the above mentioned amplifier, but the extremely rugged IRFP240 and IRFP9240 MosFet devices are used as the output pair, a...
Ecological recycling amplifier (6CU6)
Hi guys I have recovered these beautiful valves from an old television destined to scrap. From this I have saved the 6CU6 (h.deflection) and a double.....
New Phono amp
Very interesting points Chris and Thoersten, but I`d like to make a little step back. So, talking about my lastest design, this schematic attached.....
EL84 Amp Baby Huey
This design is based upon an ECL86 Amp design posted by Yves quite some time ago. This design uses shunt feedback to reduce the output stage rp and thus better ...
EL34 schematic confusion
Too much of a good thing can confuse you. I started out looking to build a simple 15W triode / 30W Class AB1 pentode PP amplifer. Class AB1 = because.....
Project choice for KT88
I plan on building a ""high power"" amp using the KT88. Found the following circuits: 1) Which will be the better quality one to build? 2) Are .....
300BSE power amplifier circuit
Hi! I want to DIY a 300BSE power amplifier recently, could somebody recomend or provide me a wonderful and robust schematic??? I will use Lowther PM6.....
211 VT-4C Good Simple SE Schematic
Hi, does somebody have a good 211 / VT4C schematic like Air Tight ATM-211 to recommend ? If it`s possible without interstage transformer and 6SN7.....
adjusting Williamson amp
Originally Posted by artosalo My original claim was that pentode connected version is not optimum. NO! You wrote the Mullard 5-10 is not optimum. If.....
Amplifier circuit from tube radio
The comment on using the existing phono connector was to not really change anything at all. Just replace the electrolytic and paper caps, add the 3-wire line co...
DIY Fisher 800b into a mic pre
I have an almost mint condition Fisher 800b hi-fi amplifier that I want to convert into a mic pre. All of the power supply SS diodes need to be replaced with mo...
Newb question on 12AU7 gain stage
Hello Bottleheads, I am building this gain stage from Decware`s Zkit4 to use as a buffer in front of an LM3875 gain clone. The chip amp has plenty of.....
6G2 amp volume and tone play up on one input only
Hi there - i`m a newbie here so please be nice if I tread on any toes And please take a deep breath - I have a fair bit to say, so go get some popcorn .....
Pilot 505 amp
I have looked in all the usual places and can`t seem to find one? Pilot 505. It has a 5AR 4,-4-,EL84`s-and 2, 12AX7`s. Thanks for any help you may.....
Odd-ball PI circuit identification request and headroom question
This schematic is modified from an old Bell & Howell projector amp for model 302 - PP 6v6`s with a 12AU7 PI. Can anyone identify the PI circuit It appears close...
Power supply with Borbely style 12AU7/MOSFET hybrid
I`m building a tube/MOSFET hybrid power amplifier based on a circuit in AudioXpress by Cozza (5/01) which in turn is based on a design by Borbely.....
KT88 PP and Transformers
Originally Posted by taj Is he perhaps more accommodating than his reputation portrays? ..Todd No.....
Analog Summing
Hey Guys, I`d like to build a analog summing amplifier. Perfect would be with tubes. I want to get the typical tube sound, if it`s possible. So I want .....
6l6/12ax7 schematics
hi everyone, my name is mike, i come from a small country called new zealand- i am currently planning to build a 6l6 push pull stereo power and pre.....