One pair HM3S High Bias Class AB Amplifier bare PCB base on GOLDMUND GM29 120W*2
Description:
Size: 120*75*1.6MM 1OZ copper spray tin process, FR4 board grade A
HM3S refers to the circuit design of Gaowen GM29 post-amplifier, adds VBE adjustment circuit, and the end tube increases emitter resistance, which can be easily adjusted to 30W pure Class A.
Manufacturing small points:
Because this circuit is designed for differential differential input, the input differential tube and voltage stage can be paired with the same pole, and the other tubes can be unpaired.
This version uses+/- 50VDC input. When pure Class A is set, the current is large and the heat is large. Please choose mica sheet for insulation treatment for the power tube.
The power tube package reference of this version is Hitachi 2SK1058-2SJ162. The pin position of this model is special (GSD) and is inconsistent with the general MOS pin. If you use other brands of MOS tube, you must correct the pin position.
When adjusting, the working current of the end tube should not be lower than 80MA, otherwise it is easy to have cracking sound, (can be solved by increasing the working current of the push level)
Package included:
One pair HM3S High Bias Class AB Amplifier bare PCB board
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Shipping to USA takes about 8-15 days in normal condition,other countries takes about 15-35 days.
Please verify your eBay primary shipping address. We are not responsible for any wrong or undeliverable addresses.
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