Lazy Singing Bush

[von Ah]

Looks fabulous, cody. I can only imagine the sonic bliss. Please remind us of the audio chain you’re using.
…and as has been said before, 2SK77Bs are for weaklingssssess. 😎

 

[codyt]

Thanks! For followers I use either a Broskie 12AU7 SRPP, K79 SRPP, or BA3 linestage. I have a vinyl rig (Thorens, Pearl II), but because of a space restriction have been listening to predominantly digital. For that, I use Miro's TDA1541a dac or his PCM63 dac.

 

[Vunce]

Awesome setup Cody!! 😍
Those mono's must really be keepers since the name is stenciled on the faceplate

Enjoy!!

 

[ggetzoff]

Alright, second channel completed. Sounding great! I started with the standard .2/.2 mu ratio, but will try a bit more resistance on MOS side at some point.

Now you have a popsicle in each hand!

 

[Zen Mod]

complete info with fact - which FE you're using?

 

[codyt]

I've listened to both SRPP's in the last hour. In this moment, I'm listening to the K79 SRPP w/ AVC

 

[Zen Mod]

we all know that AVC is best served when having proper buffer ( stage with looow Rout,with or without gain) in front

which means AVC seeing full swing

now, I presume that swing you need isn't overly high, but worth noting anyways ...... I don't think AVCs you can find on market these days are optimized for 50-60Vpp

so, to conclude, for sake of , when having AVC (desirable), best scenario is: input buffer going in - AVC going in - gain stage of choice going in - power follower amp

 

[codyt]

The Dac IV has a buffer at the output, so around 20R out. Dac > AVC > gain stage > LSB is how I run it. Works great.

 

[Zen Mod]

 

[Zen Mod]

now, when you get enough listening time, care to write some comparison between SB and LSB, hopefully taking in account influence of gain stage(s) in front of LSB

I mean, it could be useful to some Greedy Boy in future, sorta ridiculous having both of them and changing corresponding to mood

on second thought, not ridicolous ...... why not .......

 

[codyt]

Attaching some measurements. Not surprisingly, it measures nicely. For me, it sounds very much like my Singing Bush, but slightly cleaner and with more of that lucid, follower character. Sounds great with every linestage I've tried so far. The first measurement is with the standard .2up/.2down mu arrangement. The second adds an additional .1 to the top, so .3up/.2down. Not surprisingly, losing some of the MU gain increases the distortion a bit, but in the end I prefer this combo. Also attached a measurement of my Singing Bush for comparison (same gain part, same PSU, chassis, etc).

 

[ra7]

Looking great, Cody! Two chassis means lot of work. Congrats and well done.

For followers I use either a Broskie 12AU7 SRPP, K79 SRPP, or BA3 linestage.

No SCG? Goes great with followers

 

[Ben Mah]

0.3R up, 0.2R down, that is what I run in my THF-51S Mu-Follower Follower too.

 

[codyt]

Yes, based on your past comments I thought it would be a good combo to try.

 

[codyt]

Looking great, Cody! Two chassis means lot of work. Congrats and well done.

No SCG? Goes great with followers

Its on the list – will probably be my next pre project 🙂

 

[MEPER]

This is the pure MOSFET version which shows nice distortion profile.
I wonder if THF-51s is just "waste of money"? 🙂
Can you hear/measure the difference?

 

[Ben Mah]

That's no MOSFET. It's a 2SK77B, "lots of money" if you can find any for sale!

I am envious. 🙂

 

[ra7]

The only other person I know has them is Papa.

 

[codyt]

Don’t forget ZM 🙂

 

[MEPER]

Ok, so a 2SK77B has same "form factor" as the "puck" MOSFETs?
It is nice to see distortion profiles with dominating 2nd and a bit of 3rd and then other harmonics almost zero.