HSS preamp, anyone care to comment

Puggie · 1st September 2005, 10:42 AM

Can anyone comment on this, what do people think? I'd like to build something along the lines of this (2 or 4 channel, line level pre amps to run off 12V).

EC8010 · 1st September 2005, 03:22 PM

Comment on what, precisely?

tryff · 2nd September 2005, 07:20 AM

takamine has a preamp in there new guitars, a 12au7 tube running on six AA batteries (that's 6 volt). They claim it does some work, but not all the work of a 110/230v.

Vox, also has a preamp stompbox; a 12au7 running on 9 volt

I've searched the net for info or circuits using batteries with no luck.

can anyone help with links or info?

EC8010 · 2nd September 2005, 08:39 AM

Quote:

Originally posted by tryff
I've searched the net for info or circuits using batteries with no luck.

That will be because valves need 100V to get going. If you deliberately want a valve to distort horribly, then you can run it at low voltage, but expect the results to be very variable and dependent on individual valves. Try a search including terms like "musician" "low-voltage" "valve" (or "tube") and "distortion".

Puggie · 2nd September 2005, 09:12 AM

Quote:

Originally posted by EC8010
Comment on what, precisely?

Absolutely anything you like, I'm looking for a tube pre-amp to run of a 12V (car) supply, this is the only thing I can find so I just wondered what people thought of the design (well as much as you can comment on without schematics etc). I'd like to DIY something, I'm looking at building a VERY retro cd player for an old car, I'm talking Nixie tubes for the display and tube pre-amp, it would be based upon a SFF PC setup using a decent sound card but I just fancy some funky glowing tubes in there too. I'm thinking i really need a high voltage supply, and a very robust suitable valve, it would bea buffer not really need any gain as such. what can anyone suggest?

EC8010 · 2nd September 2005, 09:24 AM

For a car... I did a search using "space charge" and one of the better results was the "Low voltage pre-amp" thread.

Eli Duttman · 3rd September 2005, 09:28 AM

Puggie,

The 6GM8/ECC86 is your tube. It will work with "12" V. on the plate and it makes a decent cathode follower (buffer). Use a 3 V. coin cell for bias and a NPN BJT wired up as a CCS as the load.

SY · 3rd September 2005, 11:26 AM

At low voltages, you can also use Nuvistors. Not easy to find these days, but no harder than space-charge tubes. Look for 6CW4, 8056, and the like.

Puggie · 3rd September 2005, 10:34 PM

thanks for the info guys, My knowledge fo tubes starts and finishes with swapping the 12AX7s and EL 34s in my marshall and the re-biasing the power stage. I know nothing of these strange numbers you are quoting me. any chance of more info using small words and big text for my little brain to comprehend???

1st September 2005, 10:42 AM	#1
Puggie diyAudio Member Join Date: Oct 2004	HSS preamp, anyone care to comment Can anyone comment on this, what do people think? I'd like to build something along the lines of this (2 or 4 channel, line level pre amps to run off 12V).

1st September 2005, 03:22 PM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Comment on what, precisely? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

2nd September 2005, 07:20 AM	#3
tryff diyAudio Member Join Date: Aug 2005	im also intrested in this (battery) subject takamine has a preamp in there new guitars, a 12au7 tube running on six AA batteries (that's 6 volt). They claim it does some work, but not all the work of a 110/230v. Vox, also has a preamp stompbox; a 12au7 running on 9 volt I've searched the net for info or circuits using batteries with no luck. can anyone help with links or info?

2nd September 2005, 09:24 AM	#6
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	For a car... I did a search using "space charge" and one of the better results was the "Low voltage pre-amp" thread. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

3rd September 2005, 09:28 AM	#7
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Puggie, The 6GM8/ECC86 is your tube. It will work with "12" V. on the plate and it makes a decent cathode follower (buffer). Use a 3 V. coin cell for bias and a NPN BJT wired up as a CCS as the load. __________________ Eli D.

3rd September 2005, 11:26 AM	#8
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	At low voltages, you can also use Nuvistors. Not easy to find these days, but no harder than space-charge tubes. Look for 6CW4, 8056, and the like. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

3rd September 2005, 10:34 PM	#9
Puggie diyAudio Member Join Date: Oct 2004	thanks for the info guys, My knowledge fo tubes starts and finishes with swapping the 12AX7s and EL 34s in my marshall and the re-biasing the power stage. I know nothing of these strange numbers you are quoting me. any chance of more info using small words and big text for my little brain to comprehend???

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