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A wire brush to the pins really helps also

Thank you, they are really good sounding tubes

They are great tubes for sure

definitely no good and could harm your amp

@@vacuumtubesandguitars Yep!

It could me that sucks also

Toys are good!!

Probably every brand

Amperex are among the best

I will be comparing these this week in a video

Glad to be of help, I learned the hard way

The Fender was brighter also

I do agree

Tube amps are the best for sure

The RCA was smoother, less gain. But I really liked the grit of the Sovtek tall plate

@vacuumtubesandguitars yeah, I think I heard the same thing also, now that you mention it. Thanks for telling me your thoughts on both tubes!

ebay has some sellers that sell them cheap, that is where I get mine

@@vacuumtubesandguitars thanks

The tubes I make videos on I sell on ebay for low cost, I just listed a pair of tested strong 12ax7 on ebay. www.ebay.com/itm/196764159993

It definitely was

The preamp tubes do not get hot in only a few minutes time.

A little more gain also. Even tough all 4 were China made, they have a different build

the old Tung Sol are great

Exactly how it sounded in the room

@@vacuumtubesandguitars - Cool!

I am not exciting or entertaining enough.

It definitely has more gain

@@vacuumtubesandguitars for sure. Maybe the 12ay7 just sounded thin through my phone

This is true. You are correct

You're welcome!

I have some 12ax7 JJ tube boxes that say made in Czech Republic, some are Slovakian and some are even China made

Sorry I sold it a while back so I have no settings

Chinese 12AX7 tubes have a square getter 2:15. These are really Chinese tubes.

​@@АлександрЕрмаков-ю1э -the 80s square getter ECC 83 tubes were Chinese military spec. I have a few of them. They sound completely different and better than the current Chinese round getter tubes

@@td7426 Such a 12AX7 with an O-getter? i.pinimg.com/564x/9b/5e/ef/9b5eef76482773daae2d820b91c6f324.jpg

@@td7426 i hope you all know the getter does nothing but indicate when it was produced.

@@nasticanasta - yes but I stand by my statement. The 80s Beijing military spec ecc83 tubes were built to a higher standard and sound 10 times better than the current shuguang ecc83 tubes. Do your research

@@raucousrowdy6540 -right on!

You are correct on all of this!

The Sovtek seemed to have more air and gain to me when playing them

@@vacuumtubesandguitars cool. Sovtek 12ax7wa tubes don't seem to be very popular but I've always loved the way they react in all of my amps. They seem to have a neat compression to them that I don't find in other tubes.

@@td7426 They are fantastic low cost tubes!

My arthritic neuropathy hands are the problem. I agree that these are great upgradeable guitars

I forgot about the MINIWATT tubes, it has been a long time since I had one. Those short plate Sylvania's are great too.

I thought the same

@@vacuumtubesandguitars I have a Bugera V55 head and it came with 6L6s, but they blew & I had them changed to 5181 & I found they weren't as loud & broke up sooner, but the overall sound was about the same! The output wattage is a bit lower.

@@DMSProduktions I wonder why the tubes blew? May have been from a bad production batch of tubes

@@vacuumtubesandguitars Umm it was a Mk1 and i think it was from the overheating regulator issue, & it took the fuses and a valve with it! MY particular amp became the Mk2 version, & was improved & revised here, with my 1 being the prototype that was followed by Behringer after that!

The only difference in power tubes I've ever been able to actually hear was the difference between telefunken el34's and others in my marshalls and it was astonishing you can't get the telefunken's any longer wish I would have purchased a hundred back in the day they were louder and crunchy my marshalls really mis them cheers !

I am gonna do a RCA 7025 against a Sylvania 5751 soon

I like the overall warmer gutsy sound of the RCA tube better. But I've always been kind of partial to RCA preamp and Power tubes

@@td7426 I am gonna do few 5751 to 12AX7 and 7025's coming next

I've been told that the 5751 were a communications tube for the radio guys soldiers in Vietnam for calling in air strike's

@@davidhutson4257 Ad were the 6681 also, There were some of the bigger Silverface amps that came with 5751.

It is not on mine either

@@vacuumtubesandguitars There is a scan of Industrial vacuum tubes on BAMA, but it isn't listed there either. I have an original copy of the Hickok/Navships USM-118A/B tube data as well, and it's not listed there either. I suppose with the tube data I can make up an adapter and match it up to a 1960s vacuum tube AM car radio. Those all have a B+ of no more than 12vdc. Then use the 1volt setting on my 107B and pad it down with a resistor to .6volts, but that will require some research and experimentation.

I have never used a looper, I try to play the same regardless of which tube I use, but occasionally a tube gets me excited, usually when I am using 2 completely different types, like 12at7 against a 12ax7

@@vacuumtubesandguitars I understand completely! Same here. I can hear the differences between the different 12ax7 tubes I have in my DSL 40cr. And I can also feel the compression differences between the different el34 tubes that I've tried. Having said that, I just use the stock preamp tubes in my DSL 40cr because I like the way the amp sounds as it is. If it ain't broke don't fix it is kind of how I look at things. Lol

@@vacuumtubesandguitars I forgot to add that I have only tried a couple of 60s short gray plate RCA 12ax7's in V1. The stock JJ tube sounded the best so I put it back in

@@td7426 JJ tubes are great for new production. For EL34's, the Mullard re-issues and Svetlana's are really good. You can really hear a difference if you have the 60's fat bottle Sylvania's, but they are too expensive these days

If the eye tube in your 107 is the 6AF6/6AD6G and is so faded you can barely see it, they are still available as NOS from a vendor I purchase vacuum tubes from.

The only regret I have with my 107b is it is too "new" (if you can believe that) to test Raytheon Sub-miniature hearing aid vacuum tubes. I have a Hickok WECO KS-15874-L2 which will, but it needs a power supply rebuild, and that is one of many back projects I have here waiting.

@@DandyDon1 I did not about the power supply not being enough for the 6L6 and above. I have a couple 6AF6 on hand. I know the feeling about many back projects!

@@vacuumtubesandguitars With a 6550 I believe the best the 107b can do is basically test it as a diode. I have a Hickok 539B as well which as you may know contains two rather large transformers. One is for the filament voltages and the other is for the B+. When I bought it, I did not know the meter movement was on it's last legs. The meters Hickok used in their early testers were prone to failure from several problems. One of the movement pivots is damaged. The early testers run hot from the heat of the 83 and 5Y3 which causes them to drift after having been powered on for a while. The transformers both have AC leakage from their primaries to the case. So badly now that it's not safe to use the tester. The Seco 107B's amplifier circuit is much more sensitive to shorts than a Hickok which uses a neon lamp for this purpose. etc. etc.

@@vacuumtubesandguitars Here is what Alan Douglas explains in his book on page 81 about the Seco Electronics Tube tester: "While Seco's main business was tube testers, its models are not common. The 107 measures Gm and emission for most tubes, with a magic eye to read leakage. But it's plate voltage sags for higher-power tubes, to as little as 12V for the 6L6, at only 10mA plate current, so its readings are not comparable with those of other testers. It measures gas as a ratio of plate to grid current in the emission test, not the best method. Incidentally my 107 circuitry has only a passing resemblance to the schematic in the manual; evidently there were continual changes."

smooth and sweet!

Sounded the same to me also, surprisingly

Thank you

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