Location: London/Durham
Posts: 6,869
I'm Lawrence.
If it’s tortoise66 or something like that it’s Valab. I agree with Tom, really good service.
Location: London/Durham
Posts: 6,869
I'm Lawrence.
I bought some anode loading plate chokes from Kevin when he first started on E-bay. They made it to the UK, but Parcelfarce managed to deliver them to someone else and they never arrived at my address.
Kevin made me another pair for no cost as replacement. Very good service.
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The Valab version doesn't look like an exact copy of the Aleph J unless I've not caught up with later versions. The original 2005 version has an input impedance of 242k whereas the Valab one is around 22k. There are a number of other differences but some may be more down to how the circuits are drawn out on ebay vs the Pass circuit shown on diyaudio. I'd prefer an input impedance more like the original 242k but maybe there's a good reason for it being 22k on the Valab...maybe related to the volume control (which isn't shown on the ebay circuit).
Just casually musing.....
Oh I now see it's based on the Aleph-M not J. Even so it's still breathed on by Valab, which may well be a good thing in terms of making a reliable product.
Last edited by Clive; 28-12-2017 at 15:58.
TT 1 Trans-Fi Salvation with magnetic bearing + Trans-Fi Terminator T3Pro + London Reference
TT 2 Garrard 301 with NWA main bearing + Audiomods Series Six 10.5" + Ortofon 2M Mono SE
Digital Lindemann Bridge + Gustard R26 with LB external clock
Pre and Power Amp EWA M40P + M40A
Bass Amp & DSP Behringer iNuke NU3000DSP x 2
Speakers 1 Bastanis Sagarmatha Duo with twin baffleless 15" bass drivers per side
Speakers 2 MarkaudioSota Viotti Tower
I couldn't find out much about the Aleph-M design, well not that I could follow anyway (tech-speak buried in DIY threads). What I did see suggests that although it's single ended, damping factor is still healthy (around 150 - lowish for solid state but fine in the valve world) so it may well be a possible bet for Tannoys.
Incidentally I did hear a factory Pass Labs F5 with my 12in HPDs .. although it's push-pull, it didn't have the welly to get the low frequencies really running, I bet it would be nice with Golds though. Other than that I liked it. I'd say it's a fine amp but needs careful choice of speaker.
The Valab will be driving Tannoy DC6 bookshelf dual concentrics, I'm betting it will be a lovely combination. I wouldn't expect it to drive the HPDs in the main system terribly well but I will of course give it a go, you never know till you try something. I'll be running it in the study with a Pass DCB1 so I might have the pot on the front bypassed anyway as it won't be needed ... I'm not expecting any impedance nasties though, the DCB1 should be fine even with 22k. Will also be giving it a try with the Tannoy Eatons (10in dual concentric, HPD295a but in many details, more like a Gold than an HPD).
(Edit and apologies to Jake for the thread drift this isn't really helping him find one except through regular bumpage!)
The F amps, I think, were initially designed for full range speakers, if I remember all the stuff about them on 6 Moons (which is why I got my F3 for the Ocellias) Perhaps that's why the rather more complex load of a Tannoy doesn't quite make it? They are pretty low wattage.
Chris.
Location: Liverpool
Posts: 766
I'm Sandro.
I have a F5 quite different from the Vanilla version it has been in service for the past 10 years whit not a single problem and would never go back to anyting else, unless I win the lottery and spend mega bucks that is
I can help you to build one or to source the components.
PM and we take it from there
Location: belgrade serbia
Posts: 840
I'm gordan.
though aleph series were considered to be predecessors to FW, technically speaking this ain't first watt - although there are similarities with some of the FW units. if i understand correctly aleph M should stand for aleph mini so if you seek for more technical data, it should be related to mini.
i would be curious to know the final price when it arrives - custom duties, EMS plus unit price. i have a highly improved F5 unit (possibly pushed to the real limits of the circuit without any cuts) here with me which is a tad over 500 pounds.
Gordan.
Speakers: Oris Swing MkII
Amps: Thomas Mayer 300b/ Hiraga La Maison de L'Audiophile 20
Preamp: Silver AVC by eng. Ferenc Lazar
Phono Preamp: Shishido LCR by Solaja Audio
Decks: Garrard 301 Martin Bastin reworked/plinthed with Fidelity Research FR64fx
Garrard 401 in eng Ferenc Lazar solid wenge plinth with SME 3012/2
Cartridges: SPU Spirit/ Koetsu Black revisited by eng. Salai/ Miyajima Shilabe
Step Up Transformers: Tango MCT 999/ Ortofon T-5000/ Lumiere SUT
Digital: Shigaclone by eng. Ferenc Lazar with Lampizator Amber II
Wires: of sufficient length
Location: Liverpool
Posts: 766
I'm Sandro.
[QUOTE=
i have a highly improved F5 unit (possibly pushed to the real limits of the circuit without any cuts) here with me which is a tad over 500 pounds.[/QUOTE]
Please define highly improved and real limit of the circuit.
There are so many variation possible from pair of transistors used, balanced and not, turbo and not, psu used for voltage and capacitance.
I have 2 pairs biased at 2.6 A driving a pair of Polk LSi15 on 24 volts rails whit 150K uF on each rail on CRCLC the Polk are a pretty hard load to drive whit nominal impedence of 4 Homs and 87dB
I am quite happy volume wise (neighbours no so much so) to push it up to 8 volts but is quite capable to go to 22 V before clipping and the chassis is ready to take a second board and go balanced
Yes vanilla version may cost about £500 to build I do not see a limit to what can be done whit it