Not sure about the trimpot but that front panel looks diabolical! Congrats! Maybe add some intermittently flashing lights like one of those consoles from an old James Bond movie ...

SanchoPansen wrote:

Oh, I do have a question though. As you can see on the last picture, I play Hallmarks/Mosrites and you know how hot those PUs are. How do I operate the gain trimpot? With a regular Phillips head screwdriver? In which direction and how far without causing damage? Thanks in advance. Cheers!

Really cool idea (and guitar)
Possibly you dont need to adjust the gain at all. The gain/distortion with Dwell & Mix at max should be about the same as for a 6G15.

If you want to adjust the gain, use a very little screw driver (instrument type). Unfortunately SMD trim pots are this small.
Clockwise it will increase gain. There is no stop, it actually goes 360 deg, back to the point you started.

i have the same thing on my Mosrite the pups are so powerfull that i didn't have clean sound on my AC4 TV

Built mine today -- only longer than I thought, but I don't have mad soldering skillz. I used a small Hammond 1290B enclosure. As I was putting it together I assumed that, at the last step, I would find that the box was too small, but surprisingly enough it all managed to fit. I will try to post photos later.

There is no mention in the R4 instructions about installing an LED, and from reading previous posts it looks like earlier versions included this. I did a true bypass circuit, so I ran the LED through that, directly to the power supply -- the LED doesn't go to the PCB at all. I hope it doesn't blow up.

The screw for attaching the PCB to the chassis is rather long (and pointy), so I sawed the tip off of it. Again, I hope it doesn't blow up.

www.reverbnation.com/thehighfidelics

LaFleur wrote:

Just got a MOD 8AB2A1B pan for the Surfy Bear. I wanted a shorter decay but this one has a shorter, but really terrible sounding room tail. Something like a weird echo. Can not recommend it.LaFleur wrote:

Not quite sure if its also because of the smaller size of the pan...

Just curious (truly don't know) but would it have anything to do with the differences in impedance from what the circuit is designed to operate with (10/2575 vs. 8/2250) and the difference in the input/output grounding ('A' input grounded/output insulated vs. 'C' input insulated/output grounded) ?

Curious as well about the impedance range (operating tolerance if any) because a shorter pan would also fit well in a variety of stuff.

Wes
SoCal ex-pat with a snow shovel

DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices.

Badger wrote:

LaFleur wrote:

Just got a MOD 8AB2A1B pan for the Surfy Bear. I wanted a shorter decay but this one has a shorter, but really terrible sounding room tail. Something like a weird echo. Can not recommend it.LaFleur wrote:

Not quite sure if its also because of the smaller size of the pan...

Just curious (truly don't know) but would it have anything to do with the differences in impedance from what the circuit is designed to operate with (10/2575 vs. 8/2250) and the difference in the input/output grounding ('A' input grounded/output insulated vs. 'C' input insulated/output grounded) ?

Curious as well about the impedance range (operating tolerance if any) because a shorter pan would also fit well in a variety of stuff.

The FET reverb circuit is not sensitive to in/out pan impedances. In this case the difference should be negligible. A larger impedance mismatch (for example 150/2250) would affect the overall gain.
I have not tested this particular type of reverb pan. A suppose this type of pan have a shorter delay and decay and maybe a different frequency response.

The input/output grounding affects primarily the hum of the circuit.

Bjorn wrote:

"The FET reverb circuit is not sensitive to in/out pan impedances."

In that case I have to try my old Gibbs "C" pan in place of the new (cavernous-tailed) MOD pan!

Too bad it's all packed up for my move to Illinois. Will report findings after mid-January.

Squink Out!

Very nice present. Looks great!

A quick question again: the power adapter I was using is causing lots of noise, so I have to get a different one. I have a spare 12V 1A AC. Can I use this one, or will it fry the system? I think the unit needs DC, right? So AC/DC? Sorry if that's a stupid question...

The Hicadoolas

Last edited: Dec 29, 2014 01:04:40

I found this by searching with "Power Adapter Symbols".

http://www.harmonycentral.com/articles/external-power-supply-essentials

SanchoPansen wrote:

Very nice present. Looks great!

A quick question again: the power adapter I was using is causing lots of noise, so I have to get a different one. I have a spare 12V 1A AC. Can I use this one, or will it fry the system? I think the unit needs DC, right? So AC/DC? Sorry if that's a stupid question...

you seems impatient to try it ,careful of the polarity and the courant ,the surfy need DC and well regulated (Bjorn know where to find good one)
to try it before you receive the right power supply for,you could try any 9 v dc regulated for effect ,just to be careful of the polarity and avoid to play it long hours cause this power unit are too less A (more or less 100 or 200 mA) and it will warm really hot but it will works

Last edited: Dec 29, 2014 08:43:42