Jolida jd-502p

Hi Wilson667

What 12AX7 or 5751 tubes did you get to replace the existing 12AX7 tubes in your JD-502p? Also is your JD-502P the stock or upgraded one from Jolida?

Thanks

Hi Wilson667

I can't find that other thread where you were mentioning getting a quad of KT-120 tubes custom matched by TC Tubes. I'm thinking about this as well but then I found for the same money one could get a cryoed quad of KT-120s. I then also found factory matched tubes for about $25 less. Ugh. The decisions. I'm wondering which would be better.

Also if you try to get in touch with Jolida to find the plate voltage info etc for the TC tubes matching it is better to call them. I e-mailed them some questions and it took a couple of days for them to get back to me. They must be really be busy.

Just an FYI

I contacted some tube sellers regarding 12AX7 alternatives for the Jolida JD-502P. Here is what they told me. I'm just sharing info.

suggestions from Brent Jesee:

12AX7 Mullard UK made OEM labels, 1960s

12DF7 industrial low noise 12AX7, Westinghouse 1960s

12AX7 RCA made for Tung Sol long greyplate, 1950s

"Again, these 12AX7 tubes will deliver the sound you want. The 12DF7 is probably the best bargain here."

Suggestions from Jon @ thetubestore.

Preferred Series 7025

Northern Electric 12AX7

These tubes are out of my price range right now. For my 502P I'm trying matched and balanced Tung Sol re-issues now. Later I'm going to try JJ preamp tubes and then Penta low-gain 12Ax7 tubes from Doug's tubes. If I can get quality NOS tubes that are a bit easier on the wallet then I may give those a try.

Hi Johnsonwu

Again my posts are never as funny as Wolf's but here goes. Thanks for posting the information you did. You saved me at least $100 on vintage 12AX7 and 12AT7 tubes. (More money for records now!) Even if I read the 12AX7 specs I never would fully understand it and I definitely would not have known about what you said about the Jolida. I had to google what SRPP meant. I'm sticking with the 502P as a CJ Classic Sixty SE is still way out of reach for me.

Thanks for the tip Ghosthouse. I hadn't heard of tubemonger. I checked out the site and they have quite a bit of NOS tubes that are a bit different than what I saw on other sites. I shot them an e-mail about my JoLida 502P and the power tubes I'm going to use with it and to my surprise I got an e-mail reply back with suggestions a couple of hours later. Here is the suggestions I received:

12AT7 tube suggestions:

Siemens & Halske E81CC - 1966 MINT NOS 3-MICA 6201 Munich W. German Prem. ECC81 12AT7 (neutral and very musical)

BRIMAR CV4033 - MINT NOS 1960-62 Military Black Plate Prem. Grade Long Life ECC81/CV4024/12AT7 Halo Getter STC Prod ENGLAND Factory Tested (more British sound with emphasis on midrange)

12AX7 tube suggestions:

MULLARD CV4035 M8214 - MINT NOS NIB 1961 Military Box Plate Prem Grade Long Life M8137 ECC83 CV4004 12AX7 Wrinkle Glass Halo Getter Whyteleafe Prod. Dual Logo Old Shield and CV - Gt. Britain (rich midrange)

BRIMAR CV4035 - MINT NOS NIB 1961 Military Box Plate Prem. Grade Long Life ECC83/CV492/CV4004/6057/12AX7 Halo Getter STC Prod. ENGLAND (neutral and very musical)

Tungsram ECC83 12AX7 - MINT NOS NIB OCTOBER-NOVEMBER 1970 - Hungary (great tube at midprice)

Between Brent Jessee's recommendations and tubemonger's recommendations NOS tubes for my JoLida are going to run me over $250 easily for pairs of 12AX7s and 12AT7s.

To any Jolida amp owners out there.

What power conditioner do you plug your Jolida 502 amp into? I was thinking about just plugging into a 1.8 kVa isolation transformer.

Thanks in advance

Hi Zkidd

Definitely keep us in the look how it goes with the 502P monoblocks. What speakers do you have that warrant the power of 2 JD-502Ps? I own the Jolida JD-502P as well and am really happy with it. I couldn't resist trying NOS tubes and ended up with a whole GE Joint Army Navy tube complement in it now. In my system the differences are subtle between them when I had the Tung Sol KT-120s in the Jolida. There was a more pronounced difference bass wise and imaging wise between the GE 6550s vs the Penta Labs KT88s.

With your Jolida also check out the Tungsram 12AX7s with either gold or platinum level matching. Another Jolida 502P owner here has the Mullard CV4024 and the Genelex Gold Lion KT88s too and he was really liking the Tungsram 12AX7 match-up with all.