Big thanks to ROG for the Tube Reamer

[pbrommer]

Hello-
Finally, after having 2 circuits that I've built in the past couple weeks take a back seat, I decided to put together a Tube Reamer. I had everything going well and put the opamp in and.... nothing. Was frustrated and tired, so I went to bed. Next morning, I wake up and decide to read a few threads about the Reamer. Something catches my eye to look at the spec sheet for the opamp I put in. Light bulbs go on in my brain.

Moral of the story: Don't try to put a dual opamp in where only a single opamp will do!

I couldn't believe I overlooked that. Thanks ROG for the great circuit.

Patrick

[petemoore]

Re-modding a FF board, been in and out of housings, trusty board, I plugged in to try the latest encarnation...nothing...
 After a little parts jiggling [socketted ones] I started poking around with DMM and found ground in just a few seconds at the output swicth and Volume control...I got rid of that EZ enough...would have been much harder had I not gotten the idea to turn the volume knob from off.
 Put a little resistor under the volume knob [looking at schem] and you won't have to remember that it's possible to tie the output to ground by turning the volpot all the way down.

[Karmasound]

hee hee, i did the same thing. doh :oops:  

although I could get alittle sound out of it by touching the opamp on the solder side with my finger.

[the_badcliff]

Make sure you try swapping out some different diode combinations, this is a circuit that can sound fantastic when you get it tailored to your taste.

What I ended up with was a silicon and germanium in series for D1, and a Red LED for D2.  With this combination I get lots of headroom, while still a fair amount of distortion with the gain all the way up.

I also prefer a larger value gain pot, this allows you to get closer to a clean boost, with a mild amount of dirt, while still allowing for full-on gain.