Pictures of your diy Pass amplifier

[codyt]

Nice! I noticed you used Toroidy – what do you think? The amp above was my first opportunity to use Toroidy, and I was really impressed with build quality and performance.

 

[myleftear]

What can I say?
Toroidy transformer seem to be very good. I use them in 3 builds (2 more to come). But I haven’t used any other yet so I just can’t compare... (The ba-3 pre will be a first, with a transformer I don’t know how good it is.

 

[Mark Johnson]

I guess you could have a rotary switch that selects between

• Stereo
  
• Mono (L+R)
  
• Mono (L only)
  
• Mono (R only)
  
• Stereo Reverse (L and R swapped)
  
• Muted

Or the classic Balance potentiometer would be another possibility

 

[myleftear]

Thank you, mark!
Your suggestion would be my 3rd option (first was balance, output selection mute/normal/+6dB through cinemags) and I even considered an led-dimmer at this position, which would have been pretty … silly.

Re-researching the balance, had sound-au‘s solution in mind, but I‘m not sure wether it works with the attenuator’s input impedance (10k)

 

[cubicincher]

to codyt #5918

Hello codyt,


a great set of monoblocks! Very high built-quality 😉


I like them...🙄


Cheers
Dirk 😀

 

[codyt]

Thanks Dirk!

 

[SRMcGee]

codyt:

From where did you source the handles on the rear of those amps?

Regards,
Scott

 

[von Ah]

Those are included with the chassis purchase.

1pair balck full Aluminum class A amplifier chassis VU meter Amp case heatsink|Amplifier| - AliExpress

 

[SRMcGee]

von Ah:

Thanks! Handsome chassis, to be sure. Kudos to codyt for such an elegant project.

Regards,
Scott

 

[von Ah]

Agreed on that! Classy build by codyt for sure!

 

[codyt]

Thanks! Yes, they came with the Ali chassis. Regarding that, I was going for something as slender as possible that had the height to dissipate the heat. These were about the only thing I could find, but they fit the bill perfectly. And for the price, I was very pleased with the quality. They’re equivalent to around a 5U/350, and one might even be able to get a smaller stereo build into each chassis.

 

[william2001]

*******' awesome codyt

 

[mbrennwa]

I recently had the incredible fortune of acquiring a pair of the 2SK77B Tokin SITs. The clear choice was to build Nelson's 50W BAF SE Mu-follower amplifier, and I went with ZM's bullet-proof version of it, the Singing Bush.

These are very pretty! Congrats!

I wonder how/where you managed to get those 2SK77B... also, are those heatsinks big enough for a 50 W SE amp? What's the idle dissipation of your amp?

 

[Shoemaker]

Another F3

Hi,

finished the second F3. Built it for my dad and gave it to him on his 80s birthday last week.

As you can see, first tests took place with some older gear "on the fly". Maybe he is carefully checking, whether his son did it right? After connecting the F3 to the standard devices (TEAC CD, unbelievable expensive wires, Thorens, small SteinMusic DIY tupe-pre and DIY speakers built by me 25 years ago) his freshly factory-revised ASR Emitter I HD+ had to leave. Good decision, never liked it.
Dad seems to be happy. That counts.

Next step: An appropriate pre-amp. Maybe based on the BA2018?

Many thanks again to N. Pass (not to forget Jeff and DIYA in general), as now two generations are happy! Have a nice weekend!

 

[codyt]

These are very pretty! Congrats!

I wonder how/where you managed to get those 2SK77B... also, are those heatsinks big enough for a 50 W SE amp? What's the idle dissipation of your amp?

Thanks! Getting them was a fluke. Unfortunately the generous benefactor had only one pair to spare. Regarding the heat, these sinks(5U/350) are just big enough, and running babysitters during the summer months is advised. Each channel dissipates 192W.

 

[cubicincher]

to Shoemaker #5934

Hello Shoemaker,


nice amp and very nice gift/present to Pa (your Pa - not our Pa here 😉).


Enjoy the sound ...


Cheers
Dirk 😀

 

[maximax77]

I recently had the incredible fortune of acquiring a pair of the 2SK77B Tokin SITs. The clear choice was to build Nelson's 50W BAF SE Mu-follower amplifier, and I went with ZM's bullet-proof version of it, the Singing Bush.

So how does it sound? Have you been able to compare the 2SK77Bs to other SITs?

 

[codyt]

It sounds pretty spectacular. Has the same SIT magic I've heard from the Sony parts, but with more power and authority. Really impressive in the lower frequencies.

 

[maximax77]

Thanks. Your build speed is impressive, it was not that long ago that you were scouting for 2SK77s.

 

[Zen Mod]

just say it - Lucky Bstrd!