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RF Power Transistors (2SC2078)
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The seller of the good 2SC2078's I tested shows 80 of them now available--his new shipment of them must have arrived. He's raised the price slightly to $2.10/each.
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On 4/28/2025 5:11 PM, Steve Ratzlaff wrote:
My last purchase of 2078s was from another US seller on eBay--his ad shows testing them on a Peak meter--he tests them for beta (gain) at the low currents any of these test meters can only test at. I corresponded with the seller, saying such a test at such low currents didn't tell much, that a real test would be for output power. He responded that he could only test the way he was showing but that previous purchasers seemed to be happy with these 2078s. I bought 5 of them to test--they finally arrived today, after 12 days! He's in Las Vegas, only a day or two mail time from me in Arizona,? so for unknown reasons he appears to be very slow in shipping. I immediately tested all 5 and I'm very happy to report they all passed--3 gave 46 Vpp output, the other two 45.7 and 45.6 Vpp--exceeding the reference 5739 set for 45 Vpp. So these are the first Chinese 2SC2078s I can recommend, if you're looking for a decent RF power transistor. is the item and seller. Again note that you'll probably wait quite awhile to get these. |
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I use the 2078 in my QRP kits I sell at Midway Electronics. The ME40, ME80, ME30, and ME20. I get all mine from ebay sellers. They are name branded but that doesn't mean anything. I individually test each final transistor for power out, spectral purity and heat dissipation. So far of the 400 or so I have purchased, I haven't come across one that was defective. YMMV
Rick |
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