My experience with the First Watt F7


I think that many of us have a mental list of components and speakers we would like to try if circumstances and finances allow, and I'm no different. My finances are more limited than many members, but within my means I have been able to try quite a few different things over the years.

About six weeks ago I saw an ad for an F7 in great condition and having efficient speakers, it had been on my wish list to try not only because it was made for speakers just like mine, but also because I had never read a negative review of it or any of the other First Watt amps.

I want to say here that I have a lot of respect for Nelson Pass as a innovative designer and a businessman, and I once had a very positive experience with Pass Labs on a service issue. The reason that I am writing this brief review is because one member who knew that I had bought it had requested my impressions, and I am also curious to know the impressions and experiences of others here who may have owned this amp.

When I first received it, I gave ir a couple of hours to warm up. I sat down to listen, and initial impressions were good, but not great. There was good clarity in the mids and treble region, and stage width was very good but not better than what I was accustomed to. I noticed two negatives on the second day. The first was that the perceived size of instrumental images, for instance Stan Getz's sax, were 15-20% smaller. That wasn't a deal breaker, just an observation. I also noted that the timbre/tone of the sax, as well as other wind instruments and strings was not as natural sounding as I am used to.

Three days in, I was listening from the next room while working, and by now I knew that there was something else about the presentation that was more serious that was bothering me. I stopped what I was doing and put on a couple of specific songs to test a hunch, and that is when I identified the problem. The amp had no "flow", and even though individual instruments were well separated and clear sounding, nothing hung together like a real group playing together. Each instrument sounded like a separate event that didn't relate to the others. I had never had this experience before, but once I identified it, I couldn't "unhear" it. I also noticed at that time that electric guitars sounded different and less authentic than they had on other tube and solid state amps I have owned.

Finally, and this was surprising, the bass was noticeably opaque and lacking detail. I sat there in front of it listening one day, and I thought that if I was young again, and new to audio, this would probably be an amp that would impress me. 

I sold it within two weeks, confident that it was not the amp for me, but grateful that I had the opportunity to try one for myself.

I would like to hear the experiences of others familiar with the F7. 

 

  

128x128roxy54

Charles and sns,

Yes, I agree with you both. I did own and regret selling a 300b based integrated amp that had all of those qualities, but my modified Mac 2105 has the same qualities in spades, and it was even so similar in direct comparison to the 300b when I owned that.

Both have the ability to simply pass through them the feeling of air, and a realistic and complete picture of the performance. "Breath of life" as you said is a good descriptor.

With the F7, I always felt that it was trying unsuccessfully to piece together a plasticky picture of the performance.

Someone asked which speakers I was using. I am using the Klipsch Epic CF-4 version 1. They are not ruthless in any way, but they are revealing of any change made to the system.

All of this was really surprising to me considering the small parts count and deliberately simple and direct signal path of the design. Further proof that you can never guess what something is going to sound like. Of course I have to say that this was my ears on my system.

@roxy54 thank you for sharing your experience. You may have saved me at least one more buy/try/resale situation. Coming from various mosfet ss amps over decades and moving over to all-tube many years ago, I wondered if I had missed out on the latest fw iterations following Nelson’s passion to continually try different output transistors and circuit designs. Each iteration sounding different from the last. A few colleagues I was paralleling my own tube amps with including SET, PP, and strapped triode stuff ended up trying the xa25 for a while. While they liked it, all of them ended up sticking with their tube monos. I keep my eye open for a good one in the 30-60w range to alternate in once in a while, but nothing really peaking interest any more after rotating a few myself. If you try others, please keep us in mind to post more, and keep up the good work. Thanks.

If your speakers have a higher impedance, I cant recommend OTLs strongly enough. In my experience nothing can compare to the clarity and correctness of an OTL. If you like a great deal of flavor from your tube amps you might find OTLs a bit cold sounding, but I think this is simply a lack of distracting coloration. I have owned all types of tube amps and nothing has compared with OTLs. Atma-sphere makes a 60W OTL that is excellent. Despite what anyone says, transformers are an impediment. 

 

Many years ago I had a demo of an Atmasphere amp in a salon in Princeton NJ with ProAc Response 2 speakers, and it was very memorable. Those amps have a see-through transparency that is unlike anything else that I have ever heard. If I could afford them I would own a set. If I had any criticism at all, it would be that they had a bit (not much) less solidity or substance to the holographic images than some other designs, but I could easily live with that. 

Roxy, I am not surprised with your experience given your familiarity with tube amplification. I have pretty much given up trying any solid-state alternative amplification since I am never satisfied with the tone, spatial qualities etc.