Electro Harmonix 5U4GB


Availability: In stock


Quick Overview

A throwback to the RCA blackplate.

Electro Harmonix 5U4GB

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  • Electro Harmonix 5U4GB


Modeled after the vintage RCA Blackplate featuring large plate dimensions and improved grid structure for maximum power handling capabilities.



Electro-Harmonix 5U4GB Data Sheet

Customer Reviews

Mesa Boogie MKV Review by Bryan
Hey Doug,

I have been putting the Mesa Boogie Mark V through it's paces after installing the tube kit you recommended and provided me with. I wanted to take a moment to say thank you so much and also to just say WOW! The reason I bought the Mark V in the first place is because it was supposed to be like the "Swiss Army Knife" of amplifiers. But it ended up being a JEEP! An uncomfortable, rough riding and hard to control touchy pain in the arse that takes forever just to dial it in to a close enough setting. The cleans were ok but went from shimmer to ROAR with no in between. The gain stages in the crunch and lead channels were just too dark and muddy. Now....OMG! It's so expressive and articulate. Responds perfectly to every note. I spent a long time learning how to go into and out of every note of every chord cleanly and accurately. Now, I can hear my efforts so clearly and I am just thrilled. I have to say....I fell in love with those 7025s in the Channel 3 gain structure. I went with the high gain models fearing that there might be a bit too much hair but again WOW! You definitely know your tubes sir and how to match them up with the right amplifier. I am forever grateful that I happened to stumble across the source that said "Try Doug's Tubes." "They get it right there."

Thanks again Doug and looking forward to future purchases.

All the best to you.

Bryan (Posted on 6/13/15)
Mesa Boogie Dual Rectifier Roadster full retube Review by Cameron
Played the amp last night for several hours after changing the tubes. I just wanted to thank you for putting together a great tube swap for a great amplifier. My Mesa Roadster sounds fantastic! It is very quite and has a very pure tone. I was able to really dial back on the gain and get some amazing tones with less noise. I'll be honest, I was a little hesitant to order non-Mesa tubes, but I'm glad I did! The reviews on forums and on your website can be believed and I'll order from you in the future. Thanks!

Cameron (Posted on 12/21/14)

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