#56 tube line stage

Original Burnedfingers · 23rd December 2004, 11:01 PM

I did a search on a #56 tube line stage and nothing came up so I will ask if anyone has built or listened to one and if they have what their impression of it is.

The-Planet · 24th December 2004, 03:09 AM

Search for 76 based circuits - electrically indentical, just 6.3 vs 2.5v filament.

27's are also fairly similar for some ideas.

Berman did a nice 76 linestage in Sound Practices at one point, I could did out a copy...

- Gary

Original Burnedfingers · 24th December 2004, 12:20 PM

Gary,

I did a search and came up with a line stage design from Gary Primm that uses I believe a CCS. It uses a MJE350, 2N2907, several resistors and 2) leds. I don't know if I am allowed to post the schematic of it or not.

I also found what I thought was an interesting idea in Morgan Jones second edition of Valve amplifier page 97. This shows the basic concept for the design of a fixed bias cathode follower.

I am wondering if anyone has built/listened to either concept and if so their views.

mcs · 25th December 2004, 01:01 AM

I would probably make something similar to the Berman design - it's on my (much too long) to-do list. It uses a 76 grounded cathode stage direct coupled to a 6J5/6SN7 cathode follower.

Here's my own simplified schematic:
http://stiftsbogtrykkeriet.dk/~mcs/BB76.gif

Best regards,

Mikkel C. Simonsen

Original Burnedfingers · 25th December 2004, 01:30 PM

Mikkel

Your schematic looks interesting so I believe I will try it.

Now to find some good #76's

mcs · 25th December 2004, 02:06 PM

Quote:

Originally posted by burnedfingers
Now to find some good #76's

If you already have some #56s, then why not use those?

Best regards,

Mikkel C. Simonsen

23rd December 2004, 11:01 PM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	#56 tube line stage I did a search on a #56 tube line stage and nothing came up so I will ask if anyone has built or listened to one and if they have what their impression of it is.

25th December 2004, 01:01 AM	#4
mcs diyAudio Member Join Date: Aug 2003 Location: Denmark	I would probably make something similar to the Berman design - it's on my (much too long) to-do list. It uses a 76 grounded cathode stage direct coupled to a 6J5/6SN7 cathode follower. Here's my own simplified schematic: http://stiftsbogtrykkeriet.dk/~mcs/BB76.gif Best regards, Mikkel C. Simonsen __________________ My personal electronics website Remote control kits website

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24th December 2004, 03:09 AM	#2
The-Planet diyAudio Member Join Date: Mar 2003 Location: New Hampshire	Search for 76 based circuits - electrically indentical, just 6.3 vs 2.5v filament. 27's are also fairly similar for some ideas. Berman did a nice 76 linestage in Sound Practices at one point, I could did out a copy... - Gary

24th December 2004, 12:20 PM	#3
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Gary, I did a search and came up with a line stage design from Gary Primm that uses I believe a CCS. It uses a MJE350, 2N2907, several resistors and 2) leds. I don't know if I am allowed to post the schematic of it or not. I also found what I thought was an interesting idea in Morgan Jones second edition of Valve amplifier page 97. This shows the basic concept for the design of a fixed bias cathode follower. I am wondering if anyone has built/listened to either concept and if so their views.

25th December 2004, 01:30 PM	#5
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Mikkel Your schematic looks interesting so I believe I will try it. Now to find some good #76's

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