Jolida 502B correct tube allocation

From the far left. AT7 then AX7 another AX7 and then on the far right side AT7. Two center tubes are AX7's.

WOW!!

Thanks Detredwinds!!!

It's so amazing how useful is this forum.

Here in Costa RIca, there is an absolute limbo about it: we have Intel main processor plant here, Amazon, DHL, Hewlewt Packard, etc, maps customer service departments, the biggest NASA joint to development space rockets, a Peace Nobel Prize, No Army, the largest volcano crater in the world, the most beautiful beaches, but nobody knows a s...t about a vacuum tubes amplifier!

I'm very obsessive and compulsive with this kind of technical issues, if I don't bother too much, I want another a last advice:

At this moment I have Electro Harmonix and the sound that I have is very "shinny" with a feel of "we need a subwoffer", despite the Paradigme Monitor 11 and the 502B punch.

So, I'm thinking buy new tubes:

For the AX7: I'm thinking on large plate AX7's because I read get more medium bass and final bass presence:

- BLACK SABLE Sovtek 12AX7LPS
- SOVTEK 12AX7LPS Preamp Vacuum Tube
- JJ ECC803s / Hi-Performance 12AX7 / http://tubedepot.com/12ax7.html

- Mullard 12AX7 / ECC83 / http://thetubestore.com/mu12ax7.html
""Microphonics is not an issue despite the larger that average plate structure. The transconductance on my sample was the same as two NOS samples I measured. Not really high gain at all, but a real good noise floor and a nice smooth tone that doesn’t encourage ear fatigue the way some preamps can be."

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And for the AT7's:

- 12AT7 / ECC81 Mullard / http://tubedepot.com/nos-12at7-mullard.html

or

- Mullard 12AT7WA / CV4024 / http://thetubestore.com/mul12atcv.html
"The NOS Mullard 12AT7WA / CV4024 tube is low noise and long lasting. This 12AT7 tube is a very good choice for hifi preamps, driver stages, and guitar amp reverb circuits. The Mullard 12AT7 is original production from Great Britain."
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For the KT88;s

- Sovtek 6550WE / http://tubedepot.com/so-6550we.html
"The Sovtek 6550WE has higher gain / output than most others and really has a ballsy sound. Recommended for any bass application and most Hi-Fi amps. This tube has a slight bump in the midrange making it a great choice for lead guitar."

- Sovtek KT88 / http://thetubestore.com/sovtekkt88.html
""The Sovtek KT88 tube has smooth, warm and clear with excellent imaging. The bass (except for the very bottom end) is tight and the high end is crystal clear. The separation of parts and balance is better than any of the 6550 tube types."

- JJ KT88 / http://thetubestore.com/teslakt88.html
"The JJ KT88 tube has the best imaging of all the tubes in this category. The bass is unique in that it compresses the very bottom end. This provides incredible bass response without ever losing control. Overall a great KT88 tube for orchestral, opera, and jazz music."

THANKS A LOT FOR READ MY POST AND QUESTIONS!

BTW

First Detredwings, I'm clear about this true that you said in another thread: "Tubes choices are a very personal thing. For someone to say what will be best for you is almost impossible."

And, a matched pair around $48 will be finally $110 in my door (taxes and shipping to Costa Rica)

So, I'cant at this moment go for very expensive tubes...

Edoll,

I'm not sure what tubes you are refering too? Anyway be careful getting on the NOS tube rolling wagon. Expensive and you may be dissapointed. You may be perfectly happy with some new tubes like JJ or EH and save a lot of money.

You may start a thread and ask for advice on new production tubes. Good luck!

I bet there's a tiny old electronics shop someplace in Costa Rica with a treasure trove of NOS tubes...maybe that's wishful thinking and not the case, but hey...look around...