manualshive.com logo in svg

RedPlate RP50D, Operation Manual, Page: 9 / 9

Share
Download
RedPlate RP50D Operation Manual Download Page 9

RedPlate RP50DUO Operations Guide 

 

9 

 

Warning 

– No user serviceable parts inside so unless you know what you’re doing please refer to a qualified 

service person only. 

BIAS PROCEDURE  

1.  When new 6L6 GC output tubes are installed it is important to re-bias the amp for optimal performance in the FIXED (50 WATT) 

mode. No biasing needed for 6V6 tubes because they can only be used in cathode bias position. 

2.  ALWAYS HAVE A SPEAKER CONNECTED.  
3.  Use a volt meter set to DC volts at lowest scale (MV). Makes sure the black lead is the common terminal of the meter and the read 

lead is the DC voltage terminal of the meter. 

4.  Place the Amplifier in operate mode with the Master Volume and Reverb controls set to zero.  
5.  Set the 50 WATT/ 40 WATT switch to the 50 WATT position.  
6.  Place the red meter lead in the test point hole (red tip jack) And touch (or clip) the black meter lead on one of the metal output tube 

retainer clips. 

7.  Use a small flat blade screwdriver to adjust the bias pot for a reading of 72MV ± 5 MV (FYI - the plate voltage is 470 volts). The 

reading is the sum of the idle current for both tubes.  

8.  Recheck the reading after 10 minutes of operation, and again after a week or two of operation. 

 

 

RedPlateAmps Warranty 

At RedPlateAmps we pride ourselves making products that are built to last.  The workmanship in your 

RedPlate amplifier is warranted to be problem free for the lifetime of the original owner, or in the event of resale a onetime transfer to a new 

owner for warranty coverage for 3 years from the original manufacture date (please inform us of an ownership change to insure coverage).  The 

actual electrical components in your amplifier are warranted for a period of 3 years.  Exclusions are vacuum tubes, reverb tanks, cables, speakers 

and cosmetics which are warranted for 30 days. Improper handling or product misuse or product abuse or unauthorized repair work or 

unauthorized modifications may nullify your warranty. Eligibility for coverage and covered items are at the sole discretion of RedPlateAmps.

 

 

RedPlateAmps 
1812 W Cinnabar AVE 
Phoenix AZ 85021 

www.RedPlateAmps.com

 

email: 

[email protected]

 

 

Thanks again for joining the RedPlate Family 

– Henry

 

 

Summary of Contents for RP50D

Page 1: ...amily thank you for your purchase of a RedPlate RP50D amplifier Please take a moment and review this manual for an understanding of all the available features or just put all the knobs at noon and play This Manual applies to RP50D models produced after 02 01 2014 Signal Path Block Diagram RP50D ...

Page 2: ... SECTION Tweed Volume Tone The first 2 controls make up the Tweed Preamp section which is designed to produce the classic Tweed tone Volume This control sets the break up point and volume level of the Tweed channel Tone Treble is emphasized at settings past 5 more bass at the lower numbers When pulled it reduces girth for the Brownface era tone The tone control can be bypassed for a girth volume j...

Page 3: ...dle Control Controls the amount of Midrange frequencies somewhat interactive with the Bass Control Pulls to enable Deep which scoops some midrange frequencies and emphasizes Bass makes your electric sound more like an acoustic Bass Control Sets the amount of low end Can be rotated to zero where it clicks off for a full tone stack lift Mode Selector A six position rotary switch it steps through 5 p...

Page 4: ... the section Low settings are smoother and higher settings are more aggressive Drive Control Sets the amount of distortion by controlling the level between the 2 gain stages of the section EDGE Pull this control to reduce treble gain in the stage BODY Pull this control to shift into more gain and girth for the distortion SHIFT Level Control Sets the output volume of the section Higher settings are...

Page 5: ...he correct value fuse is located on the same side of the fuse drawer as the desired selection arrow Line up the appropriate arrow on the fuse drawer with the arrow on the bottom right of the module for the proper VAC selection Standby Switch This switch allows the tubes to warm up before operating the amplifier Wait 1 minute after power on to move it up to the operate position For improved tube li...

Page 6: ...he presence circuit uses global negative feedback to remove low frequencies which frees up bandwidth for more midrange and highs Think of it as a tone control to balance the relationship between highs and lows especially when the amplifier is naturally producing increased low end at louder volumes The control clicks off when rotated to zero for no presence Reverb Control Sets the amount of reverbe...

Page 7: ...on is bypassed The footswitch button does not work when the Body section s Gain control is rotated to zero because it is a duplicate function BOOST Girth Boost feature it adds volume and tone by doing a partial tone stack lift on the Blackface channel or a full tone control lift on the Tweed channel The footswitch button does not work when the Blackface channel is active and the Blackface preamp s...

Page 8: ... control panels have a protective finish that can be easily scratched with abrasives so always use a damp soft cloth to clean them never use paper towels The cabinetry can be cleaned with our super secret tolex cleaner on a paper towel 2 squirts of WD 40 and 4 squirts window cleaner do not spray on the control panels TUBE CHART All tube brands are acceptable a long plate is preferred in the Phase ...

Page 9: ...eading of 72MV 5 MV FYI the plate voltage is 470 volts The reading is the sum of the idle current for both tubes 8 Recheck the reading after 10 minutes of operation and again after a week or two of operation RedPlateAmps Warranty At RedPlateAmps we pride ourselves making products that are built to last The workmanship in your RedPlate amplifier is warranted to be problem free for the lifetime of t...

Reviews:

No comments