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Forte Model 1A, CLASS A Solid State Amplifier, Nelson Pass ...
https://skyfiaudio.com/products/forte-model-1a-class-a-solid-state-amplifier-nelson-pass-design
Forte Model 1A, CLASS A Solid State Amplifier, Nelson Pass Design. $1,499. This vintage and collectable amplifier delivers 50W of Pure Class A Sound. Just what you would expect in terms of sound quality from a Nelson Pass Design. Beautifully built, simply executed, and able to drive most loads except for the most demanding.
Quick measurements of Forte 1a, a 50wpc class A amp …
https://www.audiosciencereview.com/forum/index.php?threads/quick-measurements-of-forte-1a-a-50wpc-class-a-amp-by-nelson-pass.10637/
Dec 31, 2019. #1. Nelson updated Forte with more of the audiophile tweaks in later versions. 1a, while operating in pure class A mode, has a significant amount of negative feedback compared to its younger siblings. I had the amp on the bench to try to measure ultrasonic and RF interference from DACs into the amp, and since it was already hooked up, decided to take …
Forte' Model 1a - Pure Class A Amplifier by Nelson Pass ...
https://www.audiogon.com/listings/lisa4ag7-forte-model-1a-solid-state
That's right. The Forte Model 1a is a 50 watt per channel, pure class A amplifier which came out of the legendary Threshold factory. The 1a was updated by PASS an had improved characteristics over earlier models. Running in pure class A it's silky smooth similar to tubes, but still has the punch of solid state.
Forte Audio Model 1a Refurbished | Mark's Gear Garage | …
https://reverb.com/item/40863487-forte-audio-model-1a-refurbished
This Model 1a runs full Class A, 100 watts RMS into 4 ohms. Jon Soderberg re-capped, installed new rectifiers, biased, added Cardas posts and did a thorough health check in 2020. (Jon was on Nelson Pass' team at Threshold when the amps were built originally. He still services Threshold/Forte gear near Sacramento at vintageamprepair.net)
Forte Model 1a Class A amp runs ice cold | diyAudio
https://www.diyaudio.com/community/threads/forte-model-1a-class-a-amp-runs-ice-cold.133897/
The heatsinks in the Forté power amp models barely reach a thermal resistance number of 0.35C/W (25x5.5x15 cm, LxWxH, 20 ribs) 0.35C/W allows a max dissipation of some 90 Watts/ch, if you are not in the mood to fry eggs or other pets. The 5-pair 2SA1302/2SC3281 output stage on the heatsink of the 1a does have enough dissipation headroom to ...
Quick measurements of Forte 1a, a 50wpc class A amp …
https://www.audiosciencereview.com/forum/index.php?threads/quick-measurements-of-forte-1a-a-50wpc-class-a-amp-by-nelson-pass.10637/page-3
This is an updated set of measurements of Forte 1a. Thanks for everyone's comments on the previous sets of measurements! Changes made for this run: Bias adjusted for class A operation; USB to SPDIF/optical converter into Holo Spring DAC feeding the amp (single-ended on RCA) Laptop on battery power used to run measurements
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