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Probably be best to keep this thread (and forum) to audio amps.
My excuse was that my little 813 amp doubles as testbox for the upcoming 813 audio amps.
To get back on topic: the power supplies are reconnected to their 300B amps so I have some music while studying.
And yes, those are parafeed
Probably be best to keep this thread (and forum) to audio amps.
My excuse was that my little 813 amp doubles as testbox for the upcoming 813 audio amps.
To get back on topic: the power supplies are reconnected to their 300B amps so I have some music while studying.
And yes, those are parafeed
Attachments
my 832 pp amp lives.....
no global negative feedback...
plate B+ is a bit high at 405 volts, screen at 180 volts...
a slight red plate after 30 minutes so i am going to lose some plate B+
i reckon, about 9 watts per plate ought to do it...
how is the sound? i like it....
this amp comes with a phono stage built in....
in all my builds i implement a central ground point
no global negative feedback...
plate B+ is a bit high at 405 volts, screen at 180 volts...
a slight red plate after 30 minutes so i am going to lose some plate B+
i reckon, about 9 watts per plate ought to do it...
how is the sound? i like it....
this amp comes with a phono stage built in....
in all my builds i implement a central ground point
Foreign language post removed. diyAudio is an English language forum.Hi guys! A while back I was asking questions on how to properly get at wiring up a preamp properly. And now with all your guys help and tips, it is now complete!
More photos and details :
Phono Pre-Amplifier
Hi woodrough,
Viewing other members constructions I came across yours, which is really nice. Actually, I am amazed by the construction.
I noticed the 5755 tubes and also read your description of the 2 mu-follower stages. I have recently built a phonodude designed by Dick Van de Merwe (triodedick) and Doede Douma which also uses 5755 tubes at input and is 2 mu-follower stage design.
Could you send me your schematic? I could possibly try some experiments with my construction!
That is absolutely gorgeous. Nice build and nice chassis layout, design. I really like the symmetry.
Excellent photography too. Softbox + reflector?
Cheers!
~Tom
Excellent photography too. Softbox + reflector?
Cheers!
~Tom
Hi guys! A while back I was asking questions on how to properly get at wiring up a preamp properly. And now with all your guys help and tips, it is now complete!
More photos and details :
Phono Pre-Amplifier
And here is my humble phonodude implementation. Please be gentle with it, it is my first tube creation.
All metalwork is DIY, reusing side aluminium panels from abandoned lab equipment; 1.5mm for the chassis, 6.5mm for front and rear panel.
The bottom part is too short, so some components fit marginally, but I had to constrain the total construction height to 90mm (WAF related reasons included).
With the precious help from a relative greek forum (some people are around in this forum too), this project came to reality and I really enjoy it!
Still have to decide about the top/bottom covers colour and paint them, and mount them with screws.
All metalwork is DIY, reusing side aluminium panels from abandoned lab equipment; 1.5mm for the chassis, 6.5mm for front and rear panel.
The bottom part is too short, so some components fit marginally, but I had to constrain the total construction height to 90mm (WAF related reasons included).
With the precious help from a relative greek forum (some people are around in this forum too), this project came to reality and I really enjoy it!
Still have to decide about the top/bottom covers colour and paint them, and mount them with screws.
Attachments
430V B+ ,Diode rectify
Input based on mullard 5-20 using 6sn7's
Output using 6l6gc and hammond 1645's
Fixed bias to 45mA
Case I drew up and got laser-cut locally using Stainless steel.
Side vents on the tube socket are a very nice touch
.
guru? never....i am just a hobbyist happy to build amps for friends, and so my builds are always 1 off's, never repeating the same build again....
thanks to nylon ty-wraps and square plastic mounting bases, wiring is a breeze,
but the planning takes longer...
yes, i used the 6J32 analog of the EF86, these russian tubes i have grown to respect...
i do test components before soldering them in, as a common practice, i test the amp is various stages of construction to see that the target voltages are as designed, (sometimes they were slightly off....but no big deal really)
the one thing that i am proud of in my builds is that i make all the irons used in my amps, Z11/M6 in the OPT's and M18's in the power traffo....