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Bob's EZ Shop

Custom Vacuum Tube Sets for Musicians, Audiophiles and Radio Operators. All tube brands - All amps - NOS/USA/Current Production Tubes. Recycled (previously played), Generic (best value), PRIMO (most popular) and ULTIMO (best sounding) tube sets for every budget.

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  • ULTIMO Tube Sets
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Guitar Amp Tubes Sets

Our customers love our PRIMO tube sets which are value priced and include our choice of NOS and NEW production tubes in combinations for specific guitar and HI FI amplifiers.

But you wanted more – you wanted top-of-the-line brand tubes including gold pin preamp tubes for reliability and long life and closely matched dual triode sections and high power, great sounding power amp tubes by Genalex, Mullard, Tung Sol, Valve Art and USA (RCA, Sylvania, etc). So we created the ULTIMO tube sets for high end guitar amps like Ampeg, Bugera, Marshall and Traynor and HI FI amps like McIntosh, Jolida and Yaqin which have proven very popular with our customers.

As always we like to offer tube sets with brands and combinations preferred by our customers. Your feedback is crucial to our success and we appreciate your recommendations and customer success stories to share with others.

Based upon your input, tube availability and price to value performance we have selected the following tubes and brands for many of our ULTIMO sets:

We use USA made for all rectifier tubes except 5AR4/GZ34 which is JJ or Mullard if we can get them.


Gold Pin JJ or EHX for 12AT7, 12AU7, 12AX7/ECC83, 12BH7, 12DW7/7247, 6922 – these tube are known for their consistent rich and creamy tones and super reliability and closely matched dual triode sections insuring in phase operation for phase invertors in push pull circuits as well as preamp and reverb circuits.

RCA, Sylvania, GE, Telefunken, Brimar, Mullard for 12AT7/12AU7/12AX7 as available – all hand selected and matched.


300B – we like the gold pin EHX, the Valve Art 300B and the JJ and especially the ones modeled after the Western Electric 300B. They all seem to be excellent and a good substitute in many amps when you don’t want to pay the killer prices for genuine Western Electric tubes.

6550 – We like the Winged “C” the best followed by the Tung Sol and Valve Art which has had great reviews.

KT88 – Our favorite is the Genalex reissue modeled after the original Genalex and then the Winged “C” and then the big bottle JJ. If you have the extra filament power supply capacity for the upgraded Tung Sol KT-120 this also may be the ultimate KT88 replacement!

KT77 – For an EL34 replacement or upgrade with more headroom and power capability, the Genalex tops the list followed by the very good JJ.

KT66 – Need extra headroom, then the JJ is the top choice followed by the Genalex – both great 6L6 upgrades!

EL84 – Top choice goes to Genalex and then Mullard for their rich tones.

EL34 – Top choice is the Mullard which is a copy of the XF2 Mullard EL34 of the 60’s. A great upgrade is the Genalex KT77. Our UK rockers also love the Valve Art EL34 and we can hardly keep them in stock as they sound great with the gold plated preamp tubes.

6L6GC – We love the RCA black plates when we can get them or we use the 6L6GCEH which are modeled after the vintage RCA 6L6GC "blackplate," the 6L6EH features large plate dimensions and improved grid structure for increased power handling capabilities.

6V6 – We use USA made 6V6 from the 1960’s to the 1980’s. Another good contender is the JAN Phillips 6V6.

All of our ULTIMO offerings specify the tube brands we think will sound great in your amp. If you want a different combo, please let us know and we will create a special auction just for you and to share with others who have the same amplifier.

Note: These tubes are available as individual sets (1,2,4,6,8 per set) and also in selected tube sets.

When you want the best, high end tube set for rich, smooth, creamy audio, then choose our ULTIMO tube sets for selected amps. They feature gold pin JJ preamp tubes and selected high quality power amp tubes, a cut above our very popular value-priced PREMIUM tube sets.

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