On the heels of the launch of my MT-200 Adapters, these solid copper adapter plates adapt new transistors to old formats. Available soon! I just need to test them, but there’s zero reason they won’t meet expectations. Actually these adapters should offer better thermal performance than the original devices. There’s more copper mass overall, so the heat-spreading action should be superior.
I need some help from my customers! I have not yet tested these adapters in any actual amplifiers or receivers. But I have every reason to believe they’ll work perfectly. If you succeed in installing these adapters in your amp or receiver, and can provide me with clear pictures of your install that I can use on this product page, and some user-experience feedback, you will receive a refund for your purchase, up to $45 (8 adapters). Also, if you find you cannot make them work, you’ll receive a refund. I can provide support though the process; you can call or email me about it. We’ll figure it out. If it doesn’t work, it doesn’t work, and that’s the deal. (But it’s probably gonna work.)
Check it out! Thanks Tony! I’m excited about this product, this really solves a lot of problems for people trying to fix 70s and 80s amps and receivers.
Testing the thermal performance of my transistor adapters. (TO-3P to MT-200 and 2SD746/2SB706 packages for Pioneer receivers.)
UPDATE: 2024.03.03 They’re now available in the Hoppe’s Brain Shop!
Continue reading Validating the performance of my MT-200 transistor adapters
What other upgrades should I make to my amplifier? Here ya go ADCOM BOMs. This is everything I do in spreadsheet form.
One of my first Hoppe’s Brain customers sent me this beautiful old preamp to work on. Eight years ago I had refurbished for him, a pair of Adcom GFA-565’s to drive a pair of power-hungry Eminent Technology EFT-8 planar speakers. He loved my work, and sent me this preamp to restore.
Continue reading Spectral Audio DMC-10 Restoration (Send me more gear like this please!)
UPDATE: 2024.03.03 They’re now available in the Hoppe’s Brain Shop!
Here’s a (literally) cool solution to replace those MT-200 output transistors in your vintage amp or receiver! These adapters equal the excellent thermal performance of MT-200 devices, using commonly available TO-3P or TO-247 transistors.
The entire adapter is solid copper all the way through; there is no insulating layer. The TO-3P transistor is simply surface-mount soldered to the adapter, using solder-paste and hot-air. The backplate (collector) is connected to the copper body of the adapter.
Continue reading New product teaser; MT-200 to TO-3P output transistor adapters!
I’ve been making new, more reliable test jigs for all the most popular boards I sell. This jig for the BFA-555 MK1 features a replica of the entire output section of a GFA-555, but with only one pair of output transistors. Obviously, you can’t run much power through this, but it’s all I need to prove the board works.
Pogo-pins meet target pads on the underside of the board under test.
An old 1/4″ jack, a little dremelling, shrink wrap and zip ties…
I’ll just put this here. My DBX 166A compressor had terribly corroded 1/4″ phone jacks, and I found these exact replacements with gold-plated contacts. Neutrik part number NRJ6HF-1-AU (Gold plated) or NRJ6HF (Silver plated). These jacks are used in many other DBX products.
