Download LANEY VC30-212-8 service manual & repair info for electronics experts. Service manuals, schematics, eproms for electrical technicians. This site helps you to save the Earth from electronic waste! LANEY VC30-212-8. Type: (PDF) Size 1.2 MB. Category AUDIO SERVICE MANUAL. Laney vc30-112 valve changes - excellent. « Reply #1 on: June 29, 2005, 10:08:20 PM » Normally mass-volume manufacturers chuck the cheapest valves they can in their amps, because they save money when building in bulk numbers.

LANEY Ultimate Repair, Service Schematics & User Manuals

360 PDF files (Adobe Reader XI) on DVD R

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ABOUT THE FILES BELOW:
Service information manual have the complete schematics and usualy
the parts list, sometimes it have more information about fixing the unit.
Service diagrams manuals have complete schematics only.

DESCRIPTION OF MANUALS INCLUDED IN THIS DVD COMPILATION:

A1 service information manual
A1 user manual
A1+ user manual
A100R schematics
ADX Echo Unit schematics
AH Freestyle user manual
AH40 user manual
AH80 user manual
AH150 user manual
AH300 user manual
AOR30 AOR50 Serie II schematics
AOR50-12 schematics
AOR50H schematics
AOR100 Serie II schematics
AOR100H schematics
B1 B2 B3 service manual
Babel Switch Midi switcher schematics
BC30 BC50 BC75 schematics
BC30 Service diagrams schematics
BC250 Service diagrams schematics
C10 C16 Service diagrams schematics
CA series Operation manual
CA600 service information manual
CA1500 service information manual
CA3000 service information manual
Cabaret P.A. schematics
CD100 user manual
CD200 user manual
CD300 user manual
CD480M service information manual
CD516M service information manual
CD550 service information manual
CD630 service information manual
CD630M service information manual
CD640 service information manual
CD650 service information manual
CD850S service information manual
CD1042S service information manual
Chromeozone Service diagrams schematics
CK30 Keyboard amp schematics
CK30 service information manual
CK80 preamp schematics
CK80 service information manual
CK160 service information manual
CK165 service information manual
CK300 service information manual
Concept 8 Service diagrams schematics
Concept 10 Concept 16 Service diagrams schematics
Concept Application Notes
CP10 PCB schematics
CP10 service information manual
CP12 CP15 service information manual
CPC10 service information manual
CPC12 service information manual
CPC15 service information manual
CR120 CR150 Service diagrams schematics
CR300 Service diagrams schematics
CR400 Service diagrams schematics
CR410 service information manual
CR520 service information manual
CS115 CS118 CS215 information sheet + parts list
CT10 CT12 CT15 CT815 service information manual
CTX10 CTX12 CTX15 service information manual
CUB 8 user manual
CUB 10 service information manual
CUB 10 user manual
CUB 12 service information manual
CUB 12 user manual
CUB 12R Service information Manual
CUB 12R user manual
CUB HEAD user manual
CX10 12 15 user manual
CX12A CX 15A user manual
CXM-110 112 115 user manual
CXP-110 112 115 user manual
CXSub CXSubA user manual
DB150 Service diagrams schematics
DB300 Service diagrams schematics
DB400 Service diagrams schematics
DP Bass Preamp schematics
DP100 power module schematics
DP150 power module schematics
EA65-II Service diagrams schematics
EA120-II Service diagrams schematics
FS4 and FS5 Wiring
G12P Pre-Amp schematics
G300H schematics
GC30 Service diagrams schematics
GC30V schematics
GC50 Service diagrams schematics
GC50A Service diagrams schematics
GC60C Service diagrams schematics
GC80 Service diagrams schematics
GC80A Service diagrams schematics
GC120C Service information manual
GH50L Service diagrams schematics
GH50L user manual
GH100L Service diagrams schematics
GH100L user manual
GH100Ti Service diagrams schematics
GH120 schematics
GS112VE user manual
GS210VE user manual
GS212PE user manual
GS412PA 412PS user manual
HC25R schematics
HC50B schematics
HC50R schematics
HCM10 schematics
HCM15B schematics
HCM15R schematics
HCM30 30R schematics
HCM30B Service diagrams schematics
HCM30R Service diagrams schematics
HCM60B Service diagrams schematics
HCM60R Service diagrams schematics
HCM65B schematics
HCM65R schematics
HCM120 Service diagrams schematics
HCM120B Service diagrams schematics
HCM160B Service information manual
IRT 15H user manual
IRT 30-112 user manual
IRT 60-212 user manual
IRT 60H user manual
IRT 120H user manual
IRT 212 user manual
IRT 412 412A user manual
IRT-Pulse user manual
IRT-Studio user manual
IRT-X user manual
IS112P schematics
IS115P schematics
K20 MKI schematics
K20 schematics
K40B K40L schematics
K70 schematics
K100 schematics
KB50 Service diagrams schematics
KB80 schematics
KC25 Service diagrams schematics
KC50 Service diagrams schematics
KC100 Service diagrams schematics
KC150 Service diagrams schematics
KD65 S2 schematics
KD100 S2 schematics
Klip100 schematics
L5T-112 user manual
L5T-112 LionHeart Service information manual
L20H user manual
L20T-112 user manual
L30B schematics
L30R schematics
L50B schematics
L50H user manual
L50R schematics
L50SC schematics
L100R schematics
L100SC schematics
L120BH schematics
L412 user manual
LA10 user manual
LA12C user manual
LA20C user manual
LA30 Service diagrams schematics
LA35C user manual
LA60C Service diagrams schematics
LA65C schematics
LA65D user manual
LA100 PA schematics
LA200 BL schematics 1971
LBC30 LBC50 LBC75 schematics
LBC30 Service diagrams schematics
LBC50 schematics
LC15 LC15R schematics
LC15 Service diagrams schematics
LC15-110 Service information manual 2008
LC16 Combination schematics 1970
LC30 Service diagrams schematics
LC50 Service diagrams schematics
LC50 Combination schematics
LC50 Combination schematics 1973
LG12 Service information manual
LG12 user manual
LG20R user manual
LG35R Service information manual
LG35R user manual
LH50 Service diagrams schematics
LR5 user manual
LR20 user manual
LR35 user manual
LS100 schematics 1973
LT212 user manual
LV100 user manual
LV200 user manual
LV300 H Twin user manual
LV300 H Twin Service information manual
LX10 user manual
LX10B user manual
LX12 user manual
LX20 20R user manual
LX35 35R user manual
LX65R Service information manual
LX65R user manual
LX120H LX120twin Service information manual
LX120RH user manual
LX120RTwin user manual
MX500 schematics
MX900 schematics
MX1200 schematics
MXD15 Service information manual
MXD30 Service information manual
MXD65 Service information manual
MXD120 Service information manual
MXD120-H-Twin Service information manual
N115 user manual
N210 user manual
N410 user manual
NeXus FET NXF Service information manual
NeXus FET NXF user manual
NeXus Studio Live user manual
NeXus Tube NXT Service information manual
NeXus Tube NXT user manual
NX115 user manual
NX410 user manual
NX810 user manual
NXF Service information manual
NXT Service information manual
P20 Service information manual
P510 P516 Service information manual
PB400 schematics
PB400H schematics
PH400H Biamp & Powerstage schematics
PL50R schematics
PL50RH schematics
PL65R Service diagrams schematics
PL100 BH (1990) Schematic
PL100 TWIN schematics
PL100B (1989) Schematic
PL100R schematics
PL100SC schematics
R1 Service information manual
R2 Service information manual
R3 Service information manual
R3H Service information manual
R4 Service information manual
R4H Service information manual
R5 Service information manual
RB1 Service information manual
RB1 user manual
RB2 owner manual
RB3 owner manual
RB4 owner manual
RB4 preamp schematics
RB5 user manual
RB6 user manual
RB7 Service information manual
RB7 user manual
RB8 Service information manual
RB8 owner manual
RB9 Service information manual
RB9 owner manual
RB115 user manual
RB410 user manual
RBG400 Service diagrams schematics
RBG500 Service diagrams schematics
RBH700 Service diagrams schematics
RBH800 Service diagrams schematics
RBW100 Service diagrams schematics
RBW200 Service diagrams schematics
RBW300 Service diagrams schematics
SG100 MKI power amp section schematics 1969
SG100 MKI power section schematics 1969
SG100 MKI preamp section schematics 1969
Stereo 4 X 12 wiring information
SuperGroup 100 MKI power amp section schematics 1969
SuperGroup 100 MKI power section schematics 1969
SuperGroup 100 MKI preamp section schematics 1969
TF50 (TubeFusion) Service diagrams schematics
TF100 (TubeFusion) Service diagrams schematics
TF200 (TubeFusion) Service diagrams schematics
TF200 (TubeFusion) Service diagrams schematics
TF300 (TubeFusion) Service diagrams schematics
TF400 (TubeFusion) Service diagrams schematics
TF500M (TubeFusion) Service diagrams schematics
TF700 (TubeFusion) Service diagrams schematics
TF800 (TubeFusion) Service diagrams schematics
TFX1 Service information manual
TFX2 Service information manual
TFX3-H-Twin Service information manual
TFX200 Service information manual
TFX700 Service information manual
TH750 schematics
TH850 schematics
TH3200 schematics
TH4100 schematics
TH5150 schematics
TH6150 power module schematics
TH9150 power module schematics
Theatre 750 schematics
Theatre 850 schematics
Theatre 3200 schematics
Theatre 4100 schematics
Theatre 5150 schematics
TI15-112 user manual
TI100 user manual
TT20 Service information manual
TT50 Service information manual
TT50H Service information manual
TT100 Service information manual
TT100H Service information manual
VC15-110 user manual
VC30-112 210 212 user manual
VC30-112 Service manual 2008
VC30-112 service manual before 2008
VC30-210 Service manual 2008
VC30-210 service manual before 2008
VC30-212 Service manual 2008
VC30-212 service manual before 2008
VC50 Service diagrams schematics
VC100 Service diagrams schematics
VH100 Service diagrams schematics
VH100R Service diagrams schematics
VX150 schematics
VX200 schematics
VX300 schematics
VX450 schematics
VX600 schematics
VX900 schematics
VX1200 schematics
WS100SC Service diagrams schematics
WS120R Service diagrams schematics

Laney Vc30 Vs Vox Ac30

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IMPORTANT: THESE SCHEMATICS FILES ARE FOR YOUR REFERENCE ONLY.
ELABORATE SERVICE REPAIR SHOULD BE MADE BY CERTIFIED SERVICE CENTER.

‹ See more Audio/Video service manuals.

CHAMP ELECTRONICS -' THE VALVE AMPHOSPITAL'

NOTTINGHAM, ENGLAND

Belonging to agentleman named Andy who lives quite close, this Laney VC30came in with the reasonably simple fault of randomly blowing the HTfuse;apparently when it was being driven hard.Iactually didn’t think there would be muchto do in sorting out this problem, but as I went further into it thingsbecamemore complicated.

On poweringthe amp up it actually came on OK though it was only doingabout 21 watts. A little short of the claimed 30 watts! Afterremoval from the case and back onto test it was veryobvious that theset of Sovtek EL84’s were well down and under-par. I stuck inmy faithful'test-set' quad set of used-but-good Mullard EL84’s to seewhat sortof a difference that would make, but to my surprise there was noimprovement andall of a sudden one of my good ‘ole faithful Mullards gave mea fireworkdisplay! Obviously the power was removed immediately, followed by a bitof'head scratching', and wondering what the hell was going off.

On closescrutiny, I realised what had happened. Someone had changed the fourscreen grid resistors at some point in time. Normally 100 ohms, thesehad beenreplaced with 82 ohm, 2 watt wire-wound. No problem or big deal, but aspin No.9is the actual screen grid pin and pin No.1 on data sheets is 'IC'(internal connection), these 82 ohm screen grid resistors wereconnected betweenpins No.1 and No.9. This means that pin No.1 was being used as an'anchorage point'. Fine, but the problem with old Mullards and otherold brands is that as pin No.1 is this internal connection and inrealityconnected to pin No.2, being the control grid. So, more than350 volts wasnow being placed onto grid one, hence causing the firework display!

Most (but notall) brands of EL84’s nowadays do not class this pin No.1 asan 'internal connection' anymore, but simply do not use the pin at allfor any kind of connection. So, with most new branded tubes thisproblem wouldn’texist. However it still would on some brands and most certainly on NOSMullards!! Myadvise would be that if you have one of the LaneyVC30’s, don’t put Mullards into it until you havehad your amp checked outto see if the pin No.1's have been used as an anchorage point for thescreengrid resistors!?

Moving on, Isimply ripped out the pin No.1 connections and mounted all thescreen (grid 2) resistors up in the air and rewired accordingly. (Thiscan beseen in the photos.) This amp had seen other tech guys before andsomeone hadfitted separate bias resistors and caps to the four EL84 output tubes!I haveseen this a few times and often wondered why. This does not changeanything and(or) improve performance in anyway. I therefore ripped this mod out andput allback to original as can also be seen in the photos. Personally, I thinkthispointless mod is simply a money spinning 'OK, I’ve done thisforyou' yarn!!

Having done theabove fore-mentioned changes I now fitted a complete new,matched set of JJ EL84’s. These are far better than theRussian crap,'well-down', Sovtek junk that were in it. (Only my opinion ofcourse!).

After sorting aproblem with the low-gain input jack socket, everything wasnow all complete. It was looking great on the test gear and was readyto putback into the case. By the way, she was doing a good 32 watts plus nowat thisstage.

After fittingthe amp back into the case and one final test/check-up, I wassurprised to see that the power had dropped significantly to about 24watts, andthe picture on the scope was looking rather strange to say the least.Wonderingwhat was happening, I turned out all the lights to check inside thevalves(tubes), and I could see that the EL84 second from the right (lookingfrom theback) had it’s screen grid glowing very badly on full drive.Swapping two ofthe tubes around didn’t change things; the tube in this samesocket was stilldoing the same thing. So.....out came thechassis again to see what the hell was going on, but back on the bencheverything looked fine again!Afterputting the chassis back in the case for a second time, only todiscover that this strange fault was back again, I suddenly realisedwhat the problem was.

The four EL84output tubes are mounted hideously close to the internalspeaker’s magnet on this model. The EL84 second from theright is the closest one to the magnetic field from the internalspeaker, and this was causing the drive to be crippled on one half,hence drastically changing the sound and performance of the amp. Inaddition, this particular EL84 had its grid two glowing so badly onfull drive because of the situation that it is likely to be unreliableand fail prematurely because of this. Anytrans iphone backup.

I am not evensure if Laney (BLT Industries LTD) are actually aware of this problem.Theonly one thing that anybody can do to rectifythis problem is to install a shield between the output tubes andspeaker magnet,using a special metal called 'mu-metal'.Thistype of metal shields 'magneticfields' and is the only answer to this stupid, hideous design problem!

Thanks forlooking, John.

Somebodyhad modified the amp un-necessarilyby fitting separate bias resistors and caps to the four EL84output tubes.

Laney Vc30 112 Manual Diagram

Thingsrestored back to normal!

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Thosetubes are too close to that magnet!!!

UPDATE:

Laney Vc30 112 Manual Transmission

FURTHER UPDATE - DECEMBER 2008:

Laney Vc30 212

Laney Lc30 112 Manual

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