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I don't know about the F3, but the F1 and F4 run quite hot -- 50 degrees C or more, so don't know if that's a consideration or not. I believe you can build a lower power version of the F4 that may run a bit cooler, but I may be confusing this with something else. BTW, the F4 is basically a unity gain (actually very slightly less) current buffer amp, or impedance converting amp, that depends on the linestage for voltage gain.I'm intrigued enough that I've bought a set of boards and PSU boards for the future -- which you can do through Peter Daniel on the diyaudio forum. See the classifieds section and the wtb: pc boards for F4 thread. This amp supposedly combines the best attributes of the previous F series amps.Or... how abvout a tube cage .-- Jim
The F1-3 are current source amps. They are generally considered inappropriate for use with passive crossovers.
That's another thought I've had, however I was warned that it's not certain how would F4 behave with a rather complicated filter my horns utilize. For sure a current amp won't work, it needs a standard gain feed to work. The another caveat is that IMHO F4 shifts the responsibility for speakers' drive from a power amp to a pre so it would open another Pandora's box: to find a really outstanding, dead quiet preamp with enough gain. Currently I have EAR 864 which is excellent but I don't know how it would behave in such a scenario, as well as a TVC that would be out of question.
Hello aaBy the end of February I will take on a delivery of my new speakers which are 114db multihorns - 2x15" active bass in an isobarik chamber with BMS DC driver for 300-25k hz duties in a tractrix horn. So it's time to think about a proper amplification for these. The manufacturer recommends a highly tweaked gainclone: I've heard it and despite overall excellent impressions I thought it lacks a final touch of "life" that only a great SET can give. The caveat is that my system is used by my lady too and we also have 3 cats so my attention was caught by the reviews of F3 that it may be a good solution for these who wants SET sound but can't have valves for different reasons.I am aware that it is often that a product is welcomed as a killer of this and of that, however only time will tell the truth. So my post is addressed to those who have an extensive experience with F3: how does it really behave in a room on a long run. Is it a keeper or its SS nature is still something it can't runaway from.My listening priorities are an overall sense of "live"-ness, good drive and dynamic capabilities, but also a natural and sweet timbre and tone.Another option for me would be to mod my current Altmann BYOB which is I'm afraid unsufficient for really outstanding results in its stock form. It took me quite some time to listen to it in a highly revealing system to realize that there is much more to an amp duty than what it delivers.
I have a F3 for a few months already, and it's a keeper.However, it DOES NOT LIKE passive crossovers. 15W are enough to drive directly a fullrange or midrange of 95db+ efficiency.Preamp match is also difficult with a tube-like impedance.
The input impedance is the IHF standard of 10 Kohms, and the input capacitanceis very low, so you should find it easy to drive with tube equipment if you like. Itwould be a pitiful source that would not be able to deliver 240 micro-ampsrequired to clip this amplifier. The amplifier is largely indifferent to the sourceimpedance of your preamp, so a high source impedance is not a problem.
I would also disagree on the crossover comment. I have used mine ( Zv9) with a few crossovers, no crossover and 1st order high pass filters. All with great success. Also I think Nelson would disagree that it is difficult to match a pre to. QuoteThe input impedance is the IHF standard of 10 Kohms, and the input capacitanceis very low, so you should find it easy to drive with tube equipment if you like. Itwould be a pitiful source that would not be able to deliver 240 micro-ampsrequired to clip this amplifier. The amplifier is largely indifferent to the sourceimpedance of your preamp, so a high source impedance is not a problem. Low gain is the only issue so you would want the pre to be 12-20db.
Paul,Any comments on the F-3 pushing your Tonian TL-D1's?Dave
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