New Tube Preamp project

#1
I always wanted to have a 6SN7 preamp. My last attempt was converting my 56 Pre to 6J5 Transformer couple line stage. It is being rebuild atm because of the hum issue. One of my buddy recently build an simple 6SN7 2 stage preamp. It is from the VTV valley issue 11.

It sounded very nice but a bit forward. In this project I will be modify the power supply section adding a choke and 1 more stage RC filter.

I happen to have some old stock of Holco and Caddock resistors that match the value require.

It is a one gain stage with a Cathode follower design.

Just finish drilling and sanding the chassis. Just put on first coat of primer.
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TubeHiFiNut

Administrator
#2
I always wanted to have a 6SN7 preamp. My last attempt was converting my 56 Pre to 6J5 Transformer couple line stage. It is being rebuild atm because of the hum issue. One of my buddy recently build an simple 6SN7 2 stage preamp. It is from the VTV valley issue 11.

It sounded very nice but a bit forward. In this project I will be modify the power supply section adding a choke and 1 more stage RC filter.

I happen to have some old stock of Holco and Caddock resistors that match the value require.

It is a one gain stage with a Cathode follower design.

Just finish drilling and sanding the chassis. Just put on first coat of primer.
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This should be fun. :)
 
#6
Looks nice! Your project brings back memories for me. I built the VTV design 15 or 20 years ago and had a good time with it. I later rebuilt it with the Dick Olsher “Blue Velvet” circuit. There’s a lot you can do with one octal socket per channel.
 
#7
Interesting design by Dick Olsher. Do you recall the main difference between to two Amps. I know the VtV version is very simple and RAW. I am more curious about the sonic different.
 
#8
It’s been a long time since I had either of those 6sn7 circuits in my system so I can’t be very specific. I do recall the VTV had a huge soundstage with good depth; and the bass wan somewhat weak and hollow sounding. I preferred the sound of the Blue Velvet but there was something about it that I didn’t like. At this point I can’t remember any more details.
 
#14
That's a bold choice in color, Tony... and I like it!

I hate painting, though. Hate it... so a "raw" industrial finish suits my projects just fine. :)
 
#17
@Redboy I hear you regarding painting. Took me many hours to work on one chassis. I need to wait till it is all dry before sanding. All my gears are silver and black, so I was thinking a splash of colour will be fun. I already set my eye on Ferrier Red as my next project colour.

@Redboy what value of Cerefine Cap do you need? I might be able to spare couple.

Thanks everyone for the encouragement, I wasn't 100% sure about the colour until I look at the finish product.
 

billfort

Administrator
Staff member
#20
This looks interesting Tony and wow, blue paint - haven't seen something like this in your room, I like it!

You're on a tear of late too - seems just a few months ago we were talking about you starting to build again and you are almost 2 pre-amps and a pair of amps in!
 
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