flemming
Well-known member
This isn't necessarily an endorsement, just sharing my experience. I picked up a some MP38A and P28 transistors from this ebay seller:
I grabbed 20 of each (The listing quantities were different at the time). Before buying them I reached out to the seller to see about combining shipping. Because the items were already discounted eBay wouldn't let me automatically group them together. The seller got back to me right away and made a custom listing for these two items with reduced shipping. Shipping for one item was $9.80, combined it was $12. Grand total was $37.55 for 40 total. They arrived from the Ukraine in slightly less than 1 month.
I plugged all of them into a breadboard so I could let them sit for a while and not touch them while testing. Results were as follows:
P28 - hfe 50-80 (one outlier of 120), leakage was 16-27uA
MP38A - hfe 50-60 with a few slightly outside that range, leakage 82-140uA (2 were > 200, half were < 100uA)
These were tested with a TC-1 so given what was said here the above may not be the most accurate.
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6 pcs Germanium Ge NPN transistor MP38A ~ 2SD195, 2SD33, OC75 Tone Bender USSR | eBay
Similar to the 2SD195, 2SD33, OC75, 107NU70. Power dissipation 0.15W. Maximum temperature 85°C. Forward current transfer ratio (hFE) 45-100. Collector capacitance 50pF.
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12pcs Germanium Transistor Low Noise PNP P28 ~ 2N220 2N222 AC160 USSR NOS | eBay
Similar to the 2N220, 2N222, AC160. Noise Factor 5dB. Maximum temperature 85°C. Forward current transfer ratio (hFE) 20-200. Collector capacitance 50pF.
www.ebay.com
I grabbed 20 of each (The listing quantities were different at the time). Before buying them I reached out to the seller to see about combining shipping. Because the items were already discounted eBay wouldn't let me automatically group them together. The seller got back to me right away and made a custom listing for these two items with reduced shipping. Shipping for one item was $9.80, combined it was $12. Grand total was $37.55 for 40 total. They arrived from the Ukraine in slightly less than 1 month.
I plugged all of them into a breadboard so I could let them sit for a while and not touch them while testing. Results were as follows:
P28 - hfe 50-80 (one outlier of 120), leakage was 16-27uA
MP38A - hfe 50-60 with a few slightly outside that range, leakage 82-140uA (2 were > 200, half were < 100uA)
These were tested with a TC-1 so given what was said here the above may not be the most accurate.