Ace diyer - pics from Raghunadh

[Thad E Ginathom]

Raghu, I'm baffled by electronics anyway --- but I'm stunned by the metalwork that you do. Amazing.

 

[nraghunadh]

Have been completed my Dynakit ST 70. It is sounding very good.
Need to cover OPTs with aluminum enclosers.
Many thanks to Quad

 

[santhosh]

Superb fit and finish Raghu! Kudos. I am sure it will sound even better than it looks considering all the components and your efforts that have gone into it

 

[murali_n]

Hi Raghunadh,

Excellent fit and finish, need nothing to say about the sound quality, which will also be good.

Congrats.

N.Murali

 

[vin_eme]

Excellent Build Raghu!

 

[quad]

Raghu, just checked out your youtube channel. Amp is looking great!

https://www.youtube.com/user/nraghunadh

 

[prosenjit]

real hi class diy job....nothing to say...

 

[kaushik]

Raghu,

how about making few 'poor mans aluminum chessis'..mean low cost ones for forum guys?

 

[TheCoolestOne]

Raghu, amazing effort, build and superb finish. The finished product looks absolutely professional.

 

[nraghunadh]

Raghu, amazing effort, build and superb finish. The finished product looks absolutely professional.

Yes, This is Final DIY ST70

Thanks,
Raghu

 

[pdhanwada]

Yes, This is Final DIY ST70

Thanks,
Raghu

Raghu,

WOnderful,

You disproved all the folks Who says DIY works dont match professional styles.
Need to pay a visit to your place very soon.

Thanks
pandu

 

[Thad E Ginathom]

Who says DIY works dont match professional styles.

But this is a gentleman with real engineering/mechanical skills, working with real engineering tools and machinery. That combination has the possibility of matching anything in the world for quality, feel, appearance and professional finish.

 

[Audiodoc]

Great build. I have one question though. Why was the non paired tube kept in front of the left output transformer instead of the midline to make the kit symmetrical.

 

[quad]

Great build. I have one question though. Why was the non paired tube kept in front of the left output transformer instead of the midline to make the kit symmetrical.

It's the classic Dynaco ST70 layout. The original has a can type capacitor for
symmetry, but these days, many builds use a circuit board inside the chassis,
populated with modern caps, leaving the amp layout slightly asymmetric from the outside.

From an under-the-hood perspective, I would say the Rectifier tube is well placed, close to
the power transformer's B+ secondary leads.

 

[nraghunadh]

Have taken this photo with high aperture(10) and low shutter speed.

 

[Audiodoc]

Beautiful! It looks as good to the eyes as it should to the ears. Now only three senses left!

 

[grubyhalo]

That is nice!

 

[mbhangui]

Not only does it look beautiful. It looks sexy too. Well done and lot of respect for your work.

 

[doors666]

These is a very nice build, great professional work. I am sure the chassis etc costed more then the rest of the amp. As usual, I had a few questions

for the trafo covers, I see work being done on a hollow cylinder/tube open from both the sides, how did you join the end plate to it to close it
how did the home made pcb get the green color and the plating on the cu tracks.
the chassis feet are being shown in 2 colors. did you do some kind of plating or is it the pics.
Where did you get the sockets from. do you have a few spares. i cant seem the get decent sockets here. found some real crappy ones.
Are those carbon film resistors, where all you are using those and where are you using the metal film ones.
looks like you are using 12ax7/7199. any particular reason for choosing these. Did you get matched tubes.
Which rectifier tube are you using?
There are tons of pics, but none of them shows the completed innards of the amp. What all you have added inside. i see you working on pass b1, cnc phone, input selector card etc. is all that inside the single chassis. what power transformer are you using?

 

[nraghunadh]

for the trafo covers, I see work being done on a hollow cylinder/tube open from both the sides, how did you join the end plate to it to close it.

Yes, I used aluminum pipe and covered with plate. we make a grove in side of tube and fitted round plate. and again turned it in lathe to get current shape.

how did the home made pcb get the green color and the plating on the cu tracks.

That home made pcb is capacitors board. That green colored board is PC3 Driver board, both are different boards.

the chassis feet are being shown in 2 colors. did you do some kind of plating or is it the pics.

I did not used any special plating. It is normal black anodizing.

Where did you get the sockets from. do you have a few spares. i cant seem the get decent sockets here. found some real crappy ones.

These are meant for Octal relays. You can get these from any electrical shops at 40 to 50/- each

Are those carbon film resistors, where all you are using those and where are you using the metal film ones.

I used all MFRs and matched with Multimeter are all 1% tolerance.

looks like you are using 12ax7/7199. any particular reason for choosing these. Did you get matched tubes.

Yes, i bought matched 7199 tubes from US.
I did not used 12AX7. I used original dynaco 50's PC3 board to make clone.

Which rectifier tube are you using?

Used GZ34

There are tons of pics, but none of them shows the completed innards of the amp. What all you have added inside.

I will post inside pics soon.

i see you working on pass b1, cnc phone, input selector card etc. is all that inside the single chassis. what power transformer are you using?

I am using Rcore transformer in B1 preamp.

Thanks
Raghu