1) First Watt F7 amplifier clone kit containing all parts to build a working stereo amplifier (jfets, Semelab mofsets, resistors, pots), two pcbs (one for each channel) and a schematic. Nelson Pass has not released the official schematic for the F7, so this is a best-guess circuit that measures the same but may not be identical. Power supply, panel or hook up components are not included, just the parts to stuff the boards.
$160 USD plus shipping.
About the kit: this was purchased from a diyaudio member in 2020. He did the hard work of understanding the circuit, testing it, sourcing the parts, measuring transistors and pre-adjusting the pots. You can find information from him and other members who reverse engineered this circuit in the F7 thread. In addition to the kit, I will forward an email from him with additional details about his build. He bought and measured extra parts to get enough working components, and I was lucky enough to snag a set made from his excess stock. He tested components in a working circuit, so they are not factory sealed, but were not otherwise used by him or me. I never started construction. Unfortunately, running a COVID home school for my children ate all my free time for the past year and created a backlog of projects. Neither the designer nor I am making a profit: the kit is selling for the cost of the parts.
A few important details: I will share the schematic only with the buyer and only after purchase. The "long and skinny” PCBs require a longer chassis than the diyaudio deluxe and do not use the diyaudio universal heatsink drillings. You will need to source your own chassis and drill your own heatsinks. There is a silk screen error in one channel's PCB documented in the information I will give you. One of the most difficult parts of building the F7 is biasing the JFETS. This is done for you via prematched and preadjusted pots, which must go in the correct position according to the instructions. You still need to adjust the bias current by ear or with measurement, so this is not "plug and play", but much closer than if you sourced parts yourself.
2) WHAMMY headphone amplifier PCB. This is the PCB available in the diyaudio store. I have too many headphone amplifiers and will not build this one.
Save a few dollars at $20 plus shipping.
Shipping to the USA will be via USPS and is affordable. Shipping outside the USA can get quite expensive and be very slow these days.
$160 USD plus shipping.
About the kit: this was purchased from a diyaudio member in 2020. He did the hard work of understanding the circuit, testing it, sourcing the parts, measuring transistors and pre-adjusting the pots. You can find information from him and other members who reverse engineered this circuit in the F7 thread. In addition to the kit, I will forward an email from him with additional details about his build. He bought and measured extra parts to get enough working components, and I was lucky enough to snag a set made from his excess stock. He tested components in a working circuit, so they are not factory sealed, but were not otherwise used by him or me. I never started construction. Unfortunately, running a COVID home school for my children ate all my free time for the past year and created a backlog of projects. Neither the designer nor I am making a profit: the kit is selling for the cost of the parts.
A few important details: I will share the schematic only with the buyer and only after purchase. The "long and skinny” PCBs require a longer chassis than the diyaudio deluxe and do not use the diyaudio universal heatsink drillings. You will need to source your own chassis and drill your own heatsinks. There is a silk screen error in one channel's PCB documented in the information I will give you. One of the most difficult parts of building the F7 is biasing the JFETS. This is done for you via prematched and preadjusted pots, which must go in the correct position according to the instructions. You still need to adjust the bias current by ear or with measurement, so this is not "plug and play", but much closer than if you sourced parts yourself.
2) WHAMMY headphone amplifier PCB. This is the PCB available in the diyaudio store. I have too many headphone amplifiers and will not build this one.
Save a few dollars at $20 plus shipping.
Shipping to the USA will be via USPS and is affordable. Shipping outside the USA can get quite expensive and be very slow these days.
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