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Messages - szec

#1
Open Discussion / Re: OC75 G2R7 transistors
September 07, 2017, 02:37:57 PM
OK, so it seems they are legit. I tested it with 100k/100k setup as that was what I already had. I am planing to build one with lower resistance values once I have some time (I only need to finish my contract in UK and move my house and family to continental Europe - that shouldn't be too difficult  ::) ) Unfortunately, LIC is based in US so it is bit too pricey for me to buy from his store.
#2
Open Discussion / Re: OC75 G2R7 transistors
September 06, 2017, 09:08:48 PM
Cool, thanks for checking.

I actually decided to give them a try and ordered three from ebay. They have all hfe a bit above 70 and leakage from 400 to 700 uA. I through them into a tone bender mkII circuit and they sounded pretty nice. To get the sound I want I will need something with higher gain though. The fuzz is bit too compressed at the moment. I was quite surprised how quiet they are. No noise/hiss whatsoever.

Here is a pic of what I've got.


#3
Open Discussion / OC75 G2R7 transistors
September 05, 2017, 06:56:56 PM

There are quite a lot of OC75s on ebay labeled only with "OC75 G2R7". All sellers claim that they are Mullard made, but I am not so sure about it. As far as I know they should have "Mullard Made in Great Britain" on them if they are the real deal. Were they made in some other Philips factory outside UK?
Any help would be appreciated.
#4
Build Reports / Re: Ge Fuzz Face
September 01, 2017, 09:29:18 PM
Oh my. Thank you all for a very kind words! This is my fourth build ever so I am quite chuffed you like it.

Quote from: Bret608 on September 01, 2017, 05:02:31 PM
The Tagboard layout I presume?
This is a slightly modified layout from IvIark posted on tagboardeffects. I added 3k9
resistor after 10k trimmer, so trimmer in the middle will give almost stock resistance value on Q2 collector
Quote from: Bret608 on September 01, 2017, 05:02:31 PM
Curious what you used for transistor gains, and what voltage you liked for the Q2 collector.
For Q1 I had gain at around 70 and for Q2 gain was 130 and 177 uA leakage. I liked Q2C at around 6-7V as far as I remember. The pedal is already with my friend and I had a limited time to play with it.
Quote
I see what you did there on the wiring to allow a PNP setup to be used with a normal pedal power-type supply!
Just need an isolated power supply, but now days it is quite common to have one. At least I do :)
#5
Build Reports / Re: Ge Fuzz Face
September 01, 2017, 04:34:21 PM
Thank you for your very kind words  ;D

No inverter. Regular positive ground pedal. Maybe the colour of wires fooled you since I used red for negative and black for positive... ::)
#6
Build Reports / Ge Fuzz Face
September 01, 2017, 04:14:23 PM
Hello everyone,
My first post here. Really dig this forum so decided to finally register. Without further ado this is a fuzz face I did recently for my friend. Sporting two AC125