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SVT 2 PRO


waynepunkdude
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[quote name='waynepunkdude' post='1268552' date='Jun 14 2011, 12:59 PM']Couple of questions


1. How many U?
2. I have 2 cabs rated at 200W @ 8OHM each will these be ok?
3. What's all that valve bias stuff about?[/quote]

1. It's 4U (1U=1.75")
2. Yes - the SVT will work with loads down to 2Ω
3. The valve bias stuff is just a way of adjusting the voltage going to the output valves when they are at 'idle'.
On the SVT I believe there are two little screws on the back panel and a set of 'traffic lights' to make setting it up easy and removing the need for amp techs to get involved.
Once it's set it'll generally be OK to leave alone until the valves are changed.

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[quote name='waynepunkdude' post='1268598' date='Jun 14 2011, 01:35 PM']Also can I use a single 8OHM cab with it?[/quote]

My gut reaction would be to say 'yes' but a quick browse of the manual shows that the impedance selector only allows setting either 2Ω or 4Ω.
I'd go by what the manual says... :)

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[quote name='icastle' post='1268654' date='Jun 14 2011, 02:14 PM']My gut reaction would be to say 'yes' but a quick browse of the manual shows that the impedance selector only allows setting either 2Ω or 4Ω.
I'd go by what the manual says... :)[/quote]
That impedance you would be selecting is the the minimum impedance, so you could still use an 8 Ohm load, but only receive half the total wattage you would normally get.

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you only have 2 and 4 ohm settings

do not under-estimate the importance of biasing - get it wrong and the valves will blow - also the amp has a built-in valve protection system that will also close the amp down if something is wrong - in this respect some amps can be very very sensitive and be forever closing down

former svt2pro owner - i emphasize the FORMER

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[quote name='gareth' post='1268769' date='Jun 14 2011, 03:38 PM']you only have 2 and 4 ohm settings

do not under-estimate the importance of biasing - get it wrong and the valves will blow - also the amp has a built-in valve protection system that will also close the amp down if something is wrong - in this respect some amps can be very very sensitive and be forever closing down

former svt2pro owner - i emphasize the FORMER[/quote]


Right then get rid of the 2 cabs and buy 1 4OHM

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[quote name='waynepunkdude' post='1268777' date='Jun 14 2011, 03:42 PM']Right then get rid of the 2 cabs and buy 1 4OHM[/quote]

The two together will be ok - 2 x 8ohm cabs = 4 ohms - but obviously be careful about using the amp on full power bearing in mind the wattage of the cabs

Edited by gareth
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[quote name='gareth' post='1268830' date='Jun 14 2011, 04:19 PM']The two together will be ok - 2 x 8ohm cabs = 4 ohms - but obviously be careful about using the amp on full power bearing in mind the wattage of the cabs[/quote]


Yeah but taking 2 cabs to every gig is a pain in the arse.

wouldn't each cab be getting 150W?

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[quote name='Bankai' post='1268693' date='Jun 14 2011, 02:39 PM']That impedance you would be selecting is the the minimum impedance, so you could still use an 8 Ohm load, but only receive half the total wattage you would normally get.[/quote]

WRONG!

This rule is fine for most solid-state power amps. valve amps are a different bag all together. If anything you're better off going slightly lower rather than higher impedance

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Congratulations on getting an awesome amp mate, take the wise advice and use 4 ohm cabs and enjoy!
It,s worth getting a rack mounted fan at the rear to aid cooling and make sure the left side of the amp where the internal fan lives get plenty of ventilation as these cookies run hot.
Great amps! I have 2 :-D

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[quote name='wizbat' post='1268948' date='Jun 14 2011, 05:52 PM']Congratulations on getting an awesome amp mate, take the wise advice and use 4 ohm cabs and enjoy!
It,s worth getting a rack mounted fan at the rear to aid cooling and make sure the left side of the amp where the internal fan lives get plenty of ventilation as these cookies run hot.
Great amps! I have 2 :-D[/quote]


Like this ?

[url="http://cgi.ebay.co.uk/proliant-dl380-server-fan-rack-mount-kit-6x-fans-w9-/310311769249?pt=UK_Computing_Networking_SM&hash=item484005d4a1#ht_5181wt_973"]http://cgi.ebay.co.uk/proliant-dl380-serve...1#ht_5181wt_973[/url]

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[quote name='waynepunkdude' post='1268974' date='Jun 14 2011, 06:11 PM']Like this ?

[url="http://cgi.ebay.co.uk/proliant-dl380-server-fan-rack-mount-kit-6x-fans-w9-/310311769249?pt=UK_Computing_Networking_SM&hash=item484005d4a1#ht_5181wt_973"]http://cgi.ebay.co.uk/proliant-dl380-serve...1#ht_5181wt_973[/url][/quote]

That sort of thing but not that one.
That one's designed to fit onto the subrails of a 10000 series HP rack and not into the cage nut holes that you'll (hopefully) have on the rear of a rack case.

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Wow that ones got enough to suck the valves out and pebbledash the wall with them!
I was thinking more along the lines of this..
[url="http://cgi.ebay.co.uk/19-rack-mount-cooling-fans-120-mm-fans-/300567234242?pt=LH_DefaultDomain_3&hash=item45fb3406c2"]http://cgi.ebay.co.uk/19-rack-mount-coolin...=item45fb3406c2[/url]

tho i,m using only one fan in the centre for mine that twin one will keep the amp happy in even the hottest club.

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[quote name='wizbat' post='1269272' date='Jun 14 2011, 09:43 PM']Wow that ones got enough to suck the valves out and pebbledash the wall with them!
I was thinking more along the lines of this..
[url="http://cgi.ebay.co.uk/19-rack-mount-cooling-fans-120-mm-fans-/300567234242?pt=LH_DefaultDomain_3&hash=item45fb3406c2"]http://cgi.ebay.co.uk/19-rack-mount-coolin...=item45fb3406c2[/url]

tho i,m using only one fan in the centre for mine that twin one will keep the amp happy in even the hottest club.[/quote]


Excellent, cheers.


Now to find a 4OHM cab I'll be f***ed if I'm taking 2 cabs to a gig.

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[quote name='wizbat' post='1269272' date='Jun 14 2011, 09:43 PM']Wow that ones got enough to suck the valves out and pebbledash the wall with them!
I was thinking more along the lines of this..
[url="http://cgi.ebay.co.uk/19-rack-mount-cooling-fans-120-mm-fans-/300567234242?pt=LH_DefaultDomain_3&hash=item45fb3406c2"]http://cgi.ebay.co.uk/19-rack-mount-coolin...=item45fb3406c2[/url]

tho i,m using only one fan in the centre for mine that twin one will keep the amp happy in even the hottest club.[/quote]

That looks just the ticket. :)

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[quote name='waynepunkdude' post='1269282' date='Jun 14 2011, 09:51 PM']Now to find a 4OHM cab I'll be f***ed if I'm taking 2 cabs to a gig.[/quote]

I had a Pro II for a few years and it was awesome. +1 to making sure you look after it and bias it properly though. From what I can remember, there's a couple of adjusting screw/pots round the back with 2 little pairs of lights (one red/one green) to help set the bias.

If you're looking at a single cab, SERIOUSLY consider the Ampeg 410HLF. Massive sound from a single 4 Ohm cab. Great bottom end but real grunt and THE Ampeg tone. Not exactly a small 410 but not exactly a small sound either and TBH, you don't notice the weight/size as it's really portable with the wheels and handles. There's been a couple for sale recently for much cheapness!

HTH

Tony

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[quote name='tonyf' post='1269468' date='Jun 15 2011, 12:00 AM']I had a Pro II for a few years and it was awesome. +1 to making sure you look after it and bias it properly though. From what I can remember, there's a couple of adjusting screw/pots round the back with 2 little pairs of lights (one red/one green) to help set the bias.

If you're looking at a single cab, SERIOUSLY consider the Ampeg 410HLF. Massive sound from a single 4 Ohm cab. Great bottom end but real grunt and THE Ampeg tone. Not exactly a small 410 but not exactly a small sound either and TBH, you don't notice the weight/size as it's really portable with the wheels and handles. There's been a couple for sale recently for much cheapness!

HTH

Tony[/quote]


Cheers buddy, that's the exact cab I have settled on, one went on eBay last night for £275 :) but it was in Scotland :)

Glad to hear it'll do exactly what I'm after.

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