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Old 14th May 2018, 08:53 PM   #1831
chede is offline chede  Germany
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The diyAudio Firstwatt F6
M2 into Jericho Horns sounds pretty good as well.

(Fostex FE208Sigma)

Best regards,
Claas
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Old 16th May 2018, 03:51 AM   #1832
Bare is offline Bare  Canada
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Have an F6 for a year or 2 now. Working flawlessly.
Powering Tannoy Monitor Golds in Bespoke Boxes with Bespoke Xovers.
I like it enough so that I'm not even considering alternates.. ever again.
Interesting bit is I have a 2 yr old Grandaughter who loves listening with me.
Amazingly (to me) .. she will swivel her head around to follow the apparent soundstage.
Her hearing acuity (being 2 and Female) is a whole different Planet more capable than ANY of us.
Often she turns completely around, with a startled look on her face .. following music seemingly emanating from behind her... or even in another room.

About as good as it gets IMO.. after 50 yrs of this Audio Weenie sillyness.
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Old 18th May 2018, 05:45 AM   #1833
manniraj is offline manniraj  India
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Quote:
Originally Posted by chede View Post
M2 into Jericho Horns sounds pretty good as well.

(Fostex FE208Sigma)

Best regards,
Claas
I am using Sony VFET2 with the Jericho Horsn of the same Fostex 208Sigma driver. Superb combination when I paired with the DCG3 preamp followed by a heavily modded Musical Fidelity X-10D tube buffer. Got the new M2X boards but not sure how it pairs with JH.
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Old 18th May 2018, 06:06 AM   #1834
Full Range is offline Full Range  Australia
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Quote:
Originally Posted by forgehammer67 View Post
Hello everyone.

I would like build an amp diy, it will be my first achievement so i'm looking for a relatively simple amp to build. This would be to power Klipsch RF7-MKII speakers. These speakers require an amp sound rather soft and warm, or at least not aggressive in the medium-high frequencies.

I think to realize the Firstwatt F6 or F5. Do you think that these amp would make a good association with Klipsch RF7-MKII.

Thanks for your advices.

Thierry
For my Klipsch La Scala I had both F5 & F6
Both are well suited but the F6 to my taste was a better match

I have now moved on to the M2 and loving it, as it’s the best match so far
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Old 18th May 2018, 12:12 PM   #1835
wdecho is offline wdecho  United States
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You are in good company with Zen Mod, favoring the M2.
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Old 21st May 2018, 12:27 PM   #1836
chede is offline chede  Germany
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Quote:
Originally Posted by manniraj View Post
I am using Sony VFET2 with the Jericho Horsn of the same Fostex 208Sigma driver. Superb combination when I paired with the DCG3 preamp followed by a heavily modded Musical Fidelity X-10D tube buffer. Got the new M2X boards but not sure how it pairs with JH.
Slightly off-topic:

I tried various amps on my Jericho Horns / Fostex 208Sigma.

For the record, the Fostex runs crossover-less. I have added Fostex T90A as super-tweeters and a subwoofer to augment the bass in my relatively small room (18 m^2). (I had them in a larger room, approx. 45 m^2 before, and the bass of the stand-alone Jerichos went much deeper there, down to about 30Hz).
Pre-amplifiers are either a Linn AV5103 or an Aikido that I am still in the process of voicing.

I like them a lot with my diy 2A3 SE tube amp. This is a very clean amp, not tubey sounding. Very nice and fully fleshed out, bass control is good (massive output transformers)

The first solid-state amp I built has been an LM3886 chip-amp based on BrianGT boards. This sounded too mechanical / sharp for me, maybe somewhat overdamped. It has been much better since I biased it into Class A for the first watt.

Next up is a restored Sony TA-4650 VFET amp. Sounds very good, very controlled, but too my ears not yet overdamped, more incisive in the highs than the 2A3 SE, but not overly so. This amp has something that I keep coming back to, something special in the way it makes you feel listening to music.

I built an Aleph 30 with a single output pair of IRFP140 (does that make it an Aleph 10 ? ), based on BrianGT boards. Front-end was Fairchild FQP3P20 first, later converted to LSJ74, which would make it into an "Aleph J Single".
This was run at 19V rails and 2.2 amp bias (have large heatsinks ). Sounded very good, more fleshed out than the Sony TA-4650, nice harmonic structure. Also special.
When I tried the same amp at 24V rails and 2.0 amp bias, I found it a bit overdamped in the bass, sounded like a bit too much control for the Jericho Horns. Didn't like it as much as the 19V version.

Right now I am running the Jerichos with an all-Toshiba M2. 2SJ74 / 2SK170 front-end, and 2SJ201 / 2SK1530 outputs with 0.33R source resistors. It runs at 24V rails and 1.81 amp bias. Very very nice
All the punch I need, but also a lot of feeling; good control everywhere, not too much of it, and a very nice harmonic structure to the treble. Absolutely no bleached-out treble.

Sorry for the off-topic, thought it might provide some data points for folks who run Fostex wide-banders ...

manniraj, the M2 is a special amp that pairs very nicely with the Jericho Horns / Fostex 208Sigmas. With the option to choose between five different front-ends, I am certain that you will find a version you would like very much.

Best regards,
Claas
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Old 22nd May 2018, 10:11 PM   #1837
cjfrbw is offline cjfrbw  United States
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I think the M2 is an easy model to underestimate. I know that Srajan has stated it is his least favorite First Watt model, but I think he kind of missed the boat on it.

I almost missed the boat on it as well.

I bought a First Watt M2 shortly after they went out of production at a steep discount a couple of years ago. I kept it as a “spare” amplifier. I would only take it out once in a while, let it warm up, and listen.

I thought it sounded good in some ways, but a little “wonky”, like a binocular with barrel distortion.

I almost sold it but decided I needed to give it a proper try. I left it on for a week, and when I listened to it, I went WOW, where did THAT come from. It sounded great, all wonkiness and wobbles were gone.

I have been using it lately as a STAX headphone amp, where it also sounds great, albeit flanked by another output transformer for the STAX electrostatics.

The darn M2 just gets better with use. The upper midrange continues to refine in a very nice way.

Perhaps because of the magnetic, M2 requires an extended annealing and break in process, whereas VFET can be appreciated more or less immediately.

In perusing some of the Asian blogs by the transformer fanatics, they had a saying that a signal path transformer sounded better after a year of use, but best after twenty years of use. Patience, patience!
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Old 23rd May 2018, 01:32 AM   #1838
Zen Mod is online now Zen Mod  Serbia
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The diyAudio Firstwatt F6
Didn't I said that M2 is a Jewel , repeatedly?

and nobody is believing me, as usual ........

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Old 23rd May 2018, 02:48 AM   #1839
vdi_nenna is offline vdi_nenna  United States
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Quote:
Perhaps because of the magnetic, M2 requires an extended annealing and break in process, whereas VFET can be appreciated more or less immediately.
What happens if you run a demag track through your system?
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Last edited by vdi_nenna; 23rd May 2018 at 02:51 AM. Reason: Wrong quote
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Old 23rd May 2018, 04:09 AM   #1840
cjfrbw is offline cjfrbw  United States
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Originally Posted by vdi_nenna View Post
What happens if you run a demag track through your system?
I guess it's back to square one. Another twenty years of break in.

Guess I should say 'electromagnetic' or 'tranny'.

Last edited by cjfrbw; 23rd May 2018 at 04:18 AM.
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