Randall LB50H, LB50C, LB112 Operation Manual
A M P L I F I E R S
LB50H/C -LB112
OPERATION MANUAL
www.randallamplification.com
Randall Warranty
Randall Amplifiers, a Division of U.S. Music Corporation warrants the
product you have purchased to be free of defects in materials and workmanship
in normal use for a period of two (2) years from the date of original purchase.
This warranty shall run to the original purchaser when purchased from an
Authorized Randall Dealer. The manufacturer warrants speakers for a period
of (1) years. The manufacturer warrants tubes for a period of (90) days.
Defective parts found during the applicable warranty period with proof of
purchase will be replaced or repaired without charge if the complete product is
returned to US Music Corp or any Authorized Randall Service Center within
the U.S.A. Randall reserves the right to use materials readily available at the
time of the repair. All Warranty service requires Proof of Purchase (sales
receipt) to be presented at time of service request. Any repair or service
performed by any person of entity other than an Authorized Service Center is
not covered by this limited warranty. The customer pays transportation to and
from Randall factory service or any Randall Authorized Service Center. Rental
stock is warranted for (1) year from date of invoice to the Authorized dealer.
Warranty on rental units is not transferable.
What is covered against manufacturing defects
Parts and Labor to correct any defect in materials used and any defect
attributable to workmanship.
What is not covered:
Shipping Damage. Report damage upon receipt of item to the carrier (i.e.
UPS). Freight carrier must be notified upon receipt of items to insure freight
damage claim resolution. Shipping damage not filed with carriers within (48)
hrs upon receipt will not be covered under warranty. Report any shipping
damage within (48) hrs of receipt to the Randall Customer Service Dept at
1-847-949-0444, ext. 5120. Keep all original documents and packing materials
to insure freight damage claim resolution. Merchandise that has been modified
after original shipment from the Randall factory. Products whose serial
numbers have been altered or removed. Exterior normal wear and tear damage
to the finish due to misuse, operation outside the specified ratings, neglect or
accident. Warranty claims by anyone other than the original purchaser. Randall
is not responsible for any items left in protective covers or cases, (We strongly
advise that all personal items such as chords, cables, tuners, etc… be
removed!) freight charges to and from the factory or an Authorized service
center on customer owned goods, any and all charges incurred from priority
service requests (Rush Service) or priority shipping for replacement parts. Any
and all charges if no problem is found.
Return Authorization
All items being returned for any reason must have a Return Authorization
number. This RA# must be placed on the outside of the carton of the item being
returned or the carton will be refused upon delivery. Please call the customer
service department at 1-847-949-0444, ext. 5120, for the return authorization
number. Dealer stock items will be returned to the dealer freight prepaid.
An Authorized Warranty Service Center must perform any and all field
warranty service work. Customer will not pay for parts and/or labor provided
the problem found is within warranty guidelines. Proof of purchase must be
provided at the time of service request. Transportation charges to and from the
Authorized Warranty Service Center are the responsibility of the customer.
Rush service charges and special freight charges for required parts are not
covered under warranty and are also the responsibility of the customer. If a
unit is not easily transported to an authorized service center, the customer is
responsible for technician travel charges. Any charges for labor or processing
when no problem is found are also not covered under warranty. Any charges
incurred for work performed by an unauthorized service center are the
responsibility of the customer.
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LYNCHBOX SERIES
(4) 12AX7A (2) EL34L -50watts
2 Channels - Clean and Overdrive
Switchable tube driven boost for both
channels
Spring Reverb
Tube driven parallel effects loop
RFT2C Footswitch switches Channel
and Boost
Celestion Signature LYNCHBACK 50w
vintage voiced speaker
LB50C - 50w 1x12 Combo
LB50H - 50w Head
LB112 - 50w Extension Cabinet
GEORGE LYNCH SIGNATURE
LYNCHBOX
Congratulations on the purchase of your new George
Lynch Signature “LynchBox” RANDALL Amplifier!
George and all of us at Randall Amplification appreciate
that you chose this amplifier. We spent a lot of time at the
bench with George helping us refine the tone and gain
structure into this bad-ass machine you just pulled out of
the box.
Please review the safety instructions below and be
aware that the documentation provided in this manual
references 120volt USA versions of the models
covered. Note that the POWER listed on the back of
the unit should be for your countries’ power standard.
A M P L I F I E R S
16. Speaker Outputs: MINIMUM 4Ω LOAD !!!!
- LB50C- Celestion “LYNCHBACK speaker already plugged in.
- LB50C can accommodate LB112 Extension plugged into 2nd
Speaker output > This is a very cool setup as you get both a open
and closed back blend
- LB50H - plug in (1) or (2) LB112 8Ω Extension speaker cabs
- LB50 will run with 16Ω load , but will not have %100 full output
volume/wattage
17. Blend knob controls amount of effect signal mixed into effects
loop.
18. Effects loop return- the output from external effects are
inserted here. This is also the power amp input.
19. Effects loop send -the input from external effects are inserted
here. This is also the preamp output.
20. Footswitch jack- Standard 1/4” TRS controls Channel and
boost (Randall Model RF2T2C)
*IMPORTANT NOTES ON TUBES*
LB50 Amplifiers are “self biasing” so no adjustments are needed
and come with EL34L stock. The added bonus to this style of
circuit is that many different power tubes can be used in the amp
without any modification. YOU MUST USE THE SAME (2) MODEL
POWER TUBES AT THE SAME TIME- NO MIX AND MATCH!
*The user will also experience different tone variations and various
levels of output wattage-- many under 50 watts*
Use the following power tubes:
EL34/6CA7/6L6/5881/6550/KT88/KT77/6V6
1. 1/4” Guitar Input
2. “JUDGE” Channel gain- this channel is Georgeʼs
heavily modded out plexi style tone - versatile for
Blues all the way to Metal.
3. “JUDGE” Channel Volume
4. Channel Selector Switch (Footswitchable)
5. “SUPER Vʼ’ Channel Volume -this is a ʻChimeyʼ
vintage british style tone that is mostly clean but
breaks up nicely with the gain knob pushed
6. Boost - Adds layer of tube overdrive to both
channels (Footswitchable)
7. Bass EQ Response
8. Midrange EQ Response
9. Treble EQ Response
10. Presence Response
11. Master volume controls overall output
12. Standby/Play switch- Wait 5 seconds after
powering amp on before switching from Standby to
Play and -visa/versa.
13. Power switch turns unit on and off
14. Power cable input for mains connection.
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