has there been counterfeits from Tayda?
Duocast
- Thread starter caiofilipini
- Start date
caiofilipini
Well-known member
Well, to be fair, it was completely off-bias due to being reversed, I like it a lot more now!
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Members have had trouble with their Transistors!
I only get Potentiometers & Enclosures from them.
Betty Wont
Well-known member
Agreed, they have no interest in having a reputation for selling bad parts. They are resellers just like any other parts source you would use. If they are notified of a out of spec parts, they pull and test right away. I've had far more bum parts from Small Bear than Tayda. I still use Small Bear, but they have a lot more vintage, NOS, and third party supplied parts which account for it. None of them are trying to hose you, but they can't test every piece or batch of every part.
Chuck D. Bones
Circuit Wizard
I've bought many a transistor from Tayda with no problems. The only bogus parts I got from them were some 1N34s and 1N270s a couple of years back that were obviously not Germanium.
Never had a bad part from Small Bear, but I know if it ever happens they will make it right.
Hi Everybody,
I'm also building a duocast and ran into the same problem of the OP with my BC549C NPN transistor bearing a different pinout than the standard TO0-92 package. I've purchased my transistor from Mouser, so I'm sure it isn't a counterfeit. Also checking the datasheet, the pinout matches what is expected. So I think it is just the way BC549Cs are built.
I'm also building a duocast and ran into the same problem of the OP with my BC549C NPN transistor bearing a different pinout than the standard TO0-92 package. I've purchased my transistor from Mouser, so I'm sure it isn't a counterfeit. Also checking the datasheet, the pinout matches what is expected. So I think it is just the way BC549Cs are built.
Attachments
Chuck D. Bones
Circuit Wizard
That's correct. Most, but not all, TO-92 BJTs are E-B-C.
BC549x is C-B-E.
I have some 2N5232A that are E-C-B.
Always pays to check the datasheet. Any decent transistor tester will indicate the pinout.
BC549x is C-B-E.
I have some 2N5232A that are E-C-B.
Always pays to check the datasheet. Any decent transistor tester will indicate the pinout.
caiofilipini
Well-known member
Yeah, BC183L are E-C-B as well.
First post on any kind of pedal builders forum, so I apologize if I'm resurrecting a potentially tired thread. My being some 2 years late to the party would be to blame.
As my 28 or 29th circuit build, I finished soldering the odds and ends of my Duocast/Broadcast project this morning and tested for proper operation. Which sans the 3PDT High/Low Gain switch LED not working (tested correct anode/cathode placement, pretty sure the cathode lead I wiggled off took the solder pad with it..) the actual functionality of the 3PDT gain switch is still very much present.
Everything functioned as intended, so I can live with the indicator fault for the time being.
What I namely wanted to mention about this build kinda rides on what everyone that has tested multiple germanium transistor types have been gleaning. Although the OC71 doesn't happen to be a PNP Ge that I have on hand, what I do have on hand are a multitude of different Ge's spanning over a wide range of hFE/IcLeak specs that I've been collecting since the start of my circuit building roughly 2 years ago.
AC128, SA862, 2N1303, 2N1309, 3AX31C, etc., etc..
That's just from the 1st drawer of Ge tranQs I pulled a handful from. All my bulk Russian saucers went into 3 large anti-static bags all kept in a gallon freezer bag....
Anyway, one thing about the newer Broadcasts is the change in potentiometer values as well as the change from using OC71's in the first versions released over to a 2N404 (at least that's the transistor pulled out of one during a pedal teardown performed on a production dual-switch Broadcast)
Dug through the freezer bag of Russian saucers and pulled a MP39B for Q2, based on the values recorded from my test on it (DCA75, functional hFE in-circuit is going to be a bit lower than my recorded specs)
66hFE @ 0.047mA IC-Leak
Few times in my life have first attempts yielded good results, but son of a b***h; the sonic results from using the modest gain/low leakage MP39B have left me with ZERO complaints.
The circuit itself is so unbelievably rich sounding just by way of design. I think it affords you some freedom to color outside the proverbial germanium lines, and not sweat so much over the ink stamped on their cases.
TL;DR
Take literally any modest or medium-gain low-leakage PNP, toss them s**ts in-, and take it for a spin.
Seriously, Soviet NOS is far from depleted. In truth they're typically going to be the cheapest reliable germanium tranQs you can purchase in bulk, at least from my experience anyway (ymmv)
As my 28 or 29th circuit build, I finished soldering the odds and ends of my Duocast/Broadcast project this morning and tested for proper operation. Which sans the 3PDT High/Low Gain switch LED not working (tested correct anode/cathode placement, pretty sure the cathode lead I wiggled off took the solder pad with it..) the actual functionality of the 3PDT gain switch is still very much present.
Everything functioned as intended, so I can live with the indicator fault for the time being.
What I namely wanted to mention about this build kinda rides on what everyone that has tested multiple germanium transistor types have been gleaning. Although the OC71 doesn't happen to be a PNP Ge that I have on hand, what I do have on hand are a multitude of different Ge's spanning over a wide range of hFE/IcLeak specs that I've been collecting since the start of my circuit building roughly 2 years ago.
AC128, SA862, 2N1303, 2N1309, 3AX31C, etc., etc..
That's just from the 1st drawer of Ge tranQs I pulled a handful from. All my bulk Russian saucers went into 3 large anti-static bags all kept in a gallon freezer bag....
Anyway, one thing about the newer Broadcasts is the change in potentiometer values as well as the change from using OC71's in the first versions released over to a 2N404 (at least that's the transistor pulled out of one during a pedal teardown performed on a production dual-switch Broadcast)
Dug through the freezer bag of Russian saucers and pulled a MP39B for Q2, based on the values recorded from my test on it (DCA75, functional hFE in-circuit is going to be a bit lower than my recorded specs)
66hFE @ 0.047mA IC-Leak
Few times in my life have first attempts yielded good results, but son of a b***h; the sonic results from using the modest gain/low leakage MP39B have left me with ZERO complaints.
The circuit itself is so unbelievably rich sounding just by way of design. I think it affords you some freedom to color outside the proverbial germanium lines, and not sweat so much over the ink stamped on their cases.
TL;DR
Take literally any modest or medium-gain low-leakage PNP, toss them s**ts in-, and take it for a spin.
Seriously, Soviet NOS is far from depleted. In truth they're typically going to be the cheapest reliable germanium tranQs you can purchase in bulk, at least from my experience anyway (ymmv)
KR Sound
Well-known member
I have tons of MP29, 38, and 40s, and GT305b that are very nice as well
My guy... I'm not even 20 minutes since getting my feet in the door of my house, already sitting at my work bench with the enclosed Duocast.
Was totally about to lift the backing plate and pull the guts out to inspect the traces for that LED. For whatever reason I stop just before pulling the last screw, "huh, wonder if anyone else chimed in after that 'War & Peace,' of a freaking forum post I made."
Lo an behold, hommie already put that work in for me! hahaha
In all sincerity I greatly appreciate it, being able to wrap up on the bench with more time for jamming is all we can ever ask for.
Cheers
