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Amp Internals 2

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odc04r View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2017 at 3:47pm
I did replace the probes on my cheapo multi some time back. When I work on gear with HV rails I set them up on crocodile clips or similar before I energise the kit under test and then leave it the hell alone until i have finished doing whatever is on the cards. The display serves as a useful warning not to do anything dumb.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1TrueTree Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2017 at 12:57pm
I've not done any testing on powered up high voltage stuff yet. I will be when I build the Mullard 3-3 though as I'll need to check voltages going to each valve socket. Might get some help from a friend to test the valves/my work and power up on a variac just to be safe as I'm no expert
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odc04r View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2017 at 1:28pm
Variacs are good... As is current limiting. Valve circuits are actually very simple and easy to work with, as long as you follow a very simple and basic set of safety rules. Eye protection on power up is a good idea for any device too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MEAW Quote  Post ReplyReply Direct Link To This Post Posted: 05 July 2017 at 6:11pm
Nice..!! Please see share PDF schematic.
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JR.junior View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JR.junior Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2017 at 10:51am
Originally posted by odc04r odc04r wrote:

..also you have the same el cheapo multimeter as me Big smile I constantly think that I should get at least something half decent, but it does the job and keeps on ticking.


at least one with RMS reading. Wink
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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 9:17am
Recording Studio Design 800B







Kevin

North Staffordshire

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Dub Specialist Sound View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 9:52am
Nice love um

very simple build

love the old VUs
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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Robbo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbo Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 11:14am
Back in the day we used a hell of a lot of 800B amps along with the odd 800C---The great thing about them was being able to fit three of them in a standard 12U rack and still be able to lift it.
The only negative point about them was that they were crap on bass so we tended to use them on mid up and also monitors and our bass amps were all Yamaha P2200 series.
When Studiomaster brought out the Mosfet 1000 we also had a load of them as well and all models were ultra reliable amps--a lot better than the Crown DC300A and Phase Linears that we had been used to.
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salt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote salt Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 5:13pm
Soon be back on the road again kev….Wink

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 6:51pm
O yes for another 30 years 

hahah

Real amps
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbo Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 8:05pm
Originally posted by salt salt wrote:

Soon be back on the road again kev….Wink



Are those amps yours Bruce---Are you going all retro in your old age--Cheers--John.
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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2017 at 9:21pm
might have to sell one of the amps to finance the cost of a replacement switch for the other!
Kevin

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