Crookedtooth
Member
Having trouble finding this part for the Simulcast. Does anybody have any links or suggestions? Thanks!
Simulcast and the oc71 transistor
- Thread starter Crookedtooth
- Start date
Nostradoomus
Well-known member
Any PNP Germanium with an Hfe rating of 70-120 should work fine
K Pedals
Well-known member
I got mine here it took awhile to get here but they work good...
10pcs TG5S = OC71 Germanium PNP transistor 30V 10mA 75mW 1MHz - Made in Poland | eBay
Polish equivalent of OC71, AC122 etc. 30V 10mA 75mW 1MHz. Made in Poland. Manufacturer: UNITRA CEMI Warsaw in 1976.
rover.ebay.com
Jovi Bon Kenobi
Well-known member
Smallbear also has them but they are $10 for one.
smallbear-electronics.mybigcommerce.com
Transistor - The Rangemaster Newmarket OC71
smallbear-electronics.mybigcommerce.com
Have to agree with Nostradoomus. Having built plenty of pedals with Ge transistors, both pricey and cheap, I have come to the conclusion that there is not a great deal of difference in the types of Ge trannies. Maybe there is in some circuits but if you're just using them to go grrrrr then I don't hear it! I've had great results with inexpensive Russian Ge transistors bought off Ebay. Hardest bit is finding higher hfe with low leakage, but it can be done. If anything I've had better luck with the Russian Ges than with the more expensive western Euro or US trannies, possibly because the good ones have already been taken.
Hey there, so what transistor did you use? I am having the same issue finding what’s recommended.
frankenteletron
Member
I found one here last week. https://tubedepot.com/products/oc71-cv5712-mullard-uk-germanium-transistor
I see these on ebay. Any issues with them and dI got mine here it took awhile to get here but they work good...
10pcs TG5S = OC71 Germanium PNP transistor 30V 10mA 75mW 1MHz - Made in Poland | eBay
Polish equivalent of OC71, AC122 etc. 30V 10mA 75mW 1MHz. Made in Poland. Manufacturer: UNITRA CEMI Warsaw in 1976.rover.ebay.com
I got mine here it took awhile to get here but they work good...
10pcs TG5S = OC71 Germanium PNP transistor 30V 10mA 75mW 1MHz - Made in Poland | eBay
Polish equivalent of OC71, AC122 etc. 30V 10mA 75mW 1MHz. Made in Poland. Manufacturer: UNITRA CEMI Warsaw in 1976.rover.ebay.com
Just ordered a batch of these....fingers crossed that they are ok and within proper gain tolerance
K Pedals
Well-known member
If I remember right at least 5 out of the 10 were in spec for the simulcast...
Nice, I can possibly build 5 of these bad boys then. Thanks!
[/QUOTE]
I just received my batch of these. Looks like around 5 of them measured in the 70-90 gain range, leakage within tolerance. I used Small Bear’s measuring technique. I haven’t built the pedal yet though. Thanks for the suggestion
Hello @Nostradoomus, I plan to buy a tested AC125 transistor. Is it better to choose hfe=70-80 or hfe=110-120 to suit better this pedal? Thanks in advance!
Teddeeh
Member
Yes, ive used these for a couple of years now from a reccomendation from TX pedals (animallizzer pedal)I got mine here it took awhile to get here but they work good...
10pcs TG5S = OC71 Germanium PNP transistor 30V 10mA 75mW 1MHz - Made in Poland | eBay
Polish equivalent of OC71, AC122 etc. 30V 10mA 75mW 1MHz. Made in Poland. Manufacturer: UNITRA CEMI Warsaw in 1976.rover.ebay.com
