[EniGmA1987]

If I wanted to use this amp with just a single mono input, and output to both left/right headphone (still mono signal since 1 input) could I basically just have the one input go into a mono potentiometer and the output for that would go into R14 and R15 and leave everything else the same? Im looking at this schematic posted a couple pages back that I assume is the same design as the PCB boards:
http://cdn.head-fi.org/9/90/90ff3244_SSMH-SCHEMATIC-12AU7.gif
I want to use this as a cheap little tube amplifier for coming line out of an electric guitar and to amplify the signal so it can be listened to on headphones nicely for nighttime playing.

 

[drabina]

If I wanted to use this amp with just a single mono input, and output to both left/right headphone (still mono signal since 1 input) could I basically just have the one input go into a mono potentiometer and the output for that would go into R14 and R15 and leave everything else the same? Im looking at this schematic posted a couple pages back that I assume is the same design as the PCB boards:
http://cdn.head-fi.org/9/90/90ff3244_SSMH-SCHEMATIC-12AU7.gif
I want to use this as a cheap little tube amplifier for coming line out of an electric guitar and to amplify the signal so it can be listened to on headphones nicely for nighttime playing.

I am not an expert, but I would populate only half of the board and use one tube and one MOSFET. No need to have both tubes and MOSFETs running to process the same signal. You would spend only half of the parts money. That of course unless you want to rebuilt it later for stereo use.
 
Even cheaper would be something like this: http://www.kitsrus.com/pdf/k87.pdf. I have built this amp into a small plastic enclosure and run my guitar thru that. It worked just fine with my 600 Ohm AKG cans. But that's a bit off topic.

 

[benoitmabille]

Hello,
This is an old thread.. 

However, if there are 1 or 2 PCB available (12AU7 or 19J6 version), I would be happy !
 
Thanks in advance.
 
Benoit
(Brussels, Belgium)

 

[Fred_fred2004]

I have plenty of the 12AU7 pcb's
 
cheers
FRED

 

[AXLM]

Hello,
 
I also am interested in 2 or 3 pcb's for the 12au7 so I have send you a pm Fred_fred2004.
 
cheers!

 

[kozmos]

What power adapter do you guys use with this pcb?

 

[Fred_fred2004]

Use the Cisco 48V power supply just the same as the original design
 
cheers
FRED

 

[Ocean7]

Use the Cisco 48V power supply just the same as the original design

cheers
FRED

Same here. I got mine off eBay, item 371015023668

Works perfectly. No noise at all.

 

[LG2015]

I'd love to get one of these 12AU7 pcbs if you still have any left. I am going to PM you now Fred_fred2004.
 
Thanks in advance!

 

[Fred_fred2004]

Plenty of boards left

 

[Wisor]

I would like to order one PCB.
 
You have a private message 
 
Regards,

 

[LG2015]

I received the pcb on Saturday. It looks good! I can't wait to build this thing! I'm just waitng on a few more parts. Thanks again.

 

[Wisor]

PCB arrived yesterday and it looks great!
 
Today I went to local electronic shop and I bought most of elements they had on stock.
 
I didn't get 0.22UF and 680UF 63V caps.
 
Shop owner ordered them, and I should get them probably in the end of next week.
 
 
 
Are these mosfets OK or do you recommend some others ?
 
http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMutXGli8Ay4kCPNvF3z2OenR4h57KMXrK4%3d

 

[DaemonSire]

Here is my Fred_fred 12AU7 SSMH. Sorry for the bad picture I need to take better ones in good light!

That thing sounds great. I am most impressed if I say so myself.

 
That's great.  If possible, could you take a picture of the inside?

 

[urshurak776]

Hi everyone. What size wire do you recommend? 20 gauge, 22 gauge?