AHHHHHHHHHHHHH My tube screamer is trying to kill me!!!

[Phorhas]

I hate that green little box! I'm positivly sure it wants me to have a stroke or a heart attak!

Yesterday I finally fixed my TS (thanx guys ). worked great, and I did the 808 mod.

today I did that Landgraff style 1k/0.22uf from feedback loop to Vr - AWSOME.

all well and good - I decided to make the input resistor (510k) 620k or 760k to better handle my Humbuckers. so I went on and did it... plugged it in and... AHHHH nothing but spllatery noise if I hit it hard enough (for about a sec - and then like bypass mode)... I checked the voltages and Vref was 4.72V and thr IC's was 5.17V . V+ was 9.01V and Gnd 0

What, for the love of god, happenes to my TS... does it hate me? I treat well (I feed it regularly with SRV and texas attitude)...

Plz help...  :cry:  :cry:  :cry:

Thanx ahead
Dan.

[brrt]

Seems pretty obvious to me where you have to search... So check out your input resistor for faulty connections, maybe even replace the resistor with the original and check if your ts still doesn't work. And of course: check every wire to pots etc. they tend to break when uncarefully handled...

grt, Brrt

[Phorhas]

Well, I did switched it back, and even changed the voltage divider resistors to be perfectly matched (0.99k & 10.0k) but still no go...

what wire or connection breaking will set the Vr off?

[brrt]

That depends on where you think Vr is too low... Have you measured Vr? And where? Do you have a oscilloscope and function generator? Than you can run trough the whole schematic starting from the input... Checking the input transistor, the opamp, etcetera.

grt, Brrt

[Phorhas]

Actually it's too high (+.72v & +5.17v on the OA lug - part of 4 and 8 - wich are 0 and 9.01)

And it starts right tat the voltage divider and that Vr goes throughout the Crkt.

[Transmogrifox]

Check the voltage at the base of the input transistor.  That sounds suspicious to me.  The 'splattery' sound makes me think that the transistor is barely on and your signal is turning it on for short segments of time on the positive half cycle.

If you are sure that all the resistors and capacitors are properly soldered, no cold solder joints or solder bridges, I would think you probably overheated the transistor in your de-soldering on the board.  I have done this many times.  When you solder or desolder near active components (IC's, transistors, voltage regulators), you have to be careful to minimize the amount of time that you have heat on the board because semiconductor devices generally don't like high heat for extended periods of time.

Finally, don't let it get you down.  I have done these kinds of things many times.  I had a distortion pedal I made with 2N7000 MOSFETs that has taken gobs of my time because it was one thing after another after another after another.... You'll learn things that will save you that much time on future DIY endeavors.  I have noticed after doing a few more pedal mods and perf board circuits that my efficiency and number of errors is beginning to deacrease; also my troubleshooting/fixing time is getting to be much less.

Take care