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  1. #1

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    Default Tube rollin advice-Rogue Cronus Magnum

    I purchased a new Magnum back in Feb. and thinking of trying some RCA cleartops.

    The unit has the issued 4-EH kt90's 3-12au7's with no brand on them and, 2 12ax7's no markings on these either.
    According to Rogue the 12au7 preamp tube is the most important to replace. Any thoughts or advice as to what might be a good suggestion to try? I'm driving un-modded 2.3's and have an old basic Denon cdp. If I were to try the RCA's, what difference might I hear?

    Thanks for any advice!

    Crossover upgrade w/ gmpods boards will be done in the distant future.

  2. #2

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    Love Rogue gear. When I owned the non-Magnum version of this amp, I bought a tube package from the Tube Store: http://thetubestore.com/rogue-cronus.html

    I currently use a pair of Quicksilver amps and have the premium tube package selected by the Tube Store. Awesome. Way better than the stock tubes.

  3. #3

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    Go here and scroll down until you see the table labeled "Can't decide which 12AU7 to buy?" https://www.tubeworld.com/index_high.htm

    That should help you.

    Clear tops can be good but there are so many others to try as well.
    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs

    Ofc: Wright WLA12 preamp: Anthem Amp 1: Pio Elite DV-79AVI: Airport Express: CAL Sigma II DAC: PA LS90 sonicaps and mills

  4. #4

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    Thanks guys!

    Would love to hear H9 chime in on this!

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    You might want to consider RCA blackplates,,and if you can find/afford em,,Brimar's.
    JC approves....he told me so. (F-1 nut)

  6. #6

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    Charley,I have the stock EH-90's that came with the Magnum. I currently have a pair of PSVANE 12AX7's, a very good tube. I also have a trio of Mullard CV4003's (12AU7) that I roll in and out with the RCA's that came with the amp.

    Tube preference is so subjective it's difficult to recommend a do-it-all tube that will have "your" sound. There are a ton of 12AX7 and 12AU7 varients out there, a lot of them very reasonably priced.

    Have you tried any EL-34 output tubes? I have a quad of "Winged C" Svetlana that I change out every now and then, love that buttery midrange that the 34's put out. Would like to try some Gold Lion some day.
    SDA CRS+4.1TL's/Modded SDA 1C's/Modded SDA SRS 3.1TL's/Modded SDA SRS 2.3TL's

  7. #7

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    Thanks guys! I'll probably order some clear-tops and try those for now.

  8. #8

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    It would not be a bad idea to contact Mark O'Brien at Rogue Audio for tube recommendations as well.

    He is extremely helpful.

    Good luck!
    Re-electing our politicians would be like chickens voting for Colonel Sanders

  9. #9

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    I would also consider some 7316's. They are extremely nice 12AU7 varients. I would also recommend the earlier (1950's) Mullard long plates 12AU7's.

    If you are really set on RCA clear tops, I have a number of them that I will sell for pretty cheap. If interested, PM me.

    RCA clear tops are good, but there are definately better tubes without a doubt (IMO, of course).

    Greg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

  10. #10

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    +1 on the 7316s in particular the D getters.

    It might have been Headrott that recommended them to me a while back.
    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs

    Ofc: Wright WLA12 preamp: Anthem Amp 1: Pio Elite DV-79AVI: Airport Express: CAL Sigma II DAC: PA LS90 sonicaps and mills

  11. #11

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    Yep, just about any 7316 is good, but you are right about the D-getters. Those D-getters in the Amperex tubes (and tubes in general) are very nice. They are just extremely hard to find. Plus they go for even more money than the "halo-getters". Even the "halo-getters" are very nice though.

    Greg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

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    I'm waiting to get my listening room painted and carpeted before I set my system back up. I will probably consider your offer on the RCA's. If you could PM me with what you have and what you want for them I would appriciate it. Are the Mullards pretty pricey?

  13. #13

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    12AU7's and Variants

    SYLVANIA JAN CHS & JHS 12AU7 Long Black Plates 1950's (square getters)

    RAYTHEON JAN CRP 5814A Windmill Getter Gray Plates (early 60's - A very rare one!! Just like the triple mica version, with their side wings and vertically aligned three small holes, these tubes have very unusual and robust plate construction.)

    RAYTHEON JAN CRP 5814 Black Plates & JAN CRP 5814 Triple Mica Black Plates (Military spec tube made in the 1950's. One of the most sought after American 12AU7 variant together with the CBS-Hytron 5814s. Tube rollers find their sonics very similar too. All tubes have square getters on the top.)

    RCA JRC 5814A/WA and 6189 Black Plates (The military spec tube 5814 was developed by RCA around 1950 as a lower distortion, noise and microphonics 12AU7)

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

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    I have found the SED Winged "C" El34's to be excellent, but the price has sky rocketed in the past year. There is a rumor they are not being made at this time as the Petersburg plant in Russia is shutdown. I haven't been able to confirm.

    Another great tube, and inexpensive is the JJ E34L. Very solid bottom end, thick glass, modeled after the Gold Lion KT77, nice mid's and shimmering highs. For the cost difference now between these and the Winged "C"s these are my go to. I have several pairs of Winged "C"s already. The original Tesla's are very nice as well, but prices keep creeping up on those too.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  15. #15

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    Thanks H9! I always enjoy reading your thoughts. I'm sure I'll have a small fortune invested in tubes and X-over upgrades in the future.

  16. #16

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    Quote Originally Posted by charley95 View Post
    I'm waiting to get my listening room painted and carpeted before I set my system back up. I will probably consider your offer on the RCA's. If you could PM me with what you have and what you want for them I would appriciate it. Are the Mullards pretty pricey?
    Sending a PM. The Mullards are pretty pricey because they are relatively rare and they sound great. Usually around $110.00 a pair, but are worth it IMO. They are warm, smooth, have a large soundstage and make vocals really shine. They are not the end all be all in detail, but are very detailed. I highly recommend them. As I said, the Amperex 7316's are also very good. Better than the Mullards they are more detailed and not quite as warm sounding. They also have outstanding vocal reproduction! Overall just fantastic sounding throughout the sound spectrum. Absolutely one of the best 12AU7's and varients available.

    Greg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

  17. #17

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    Quote Originally Posted by charley95 View Post
    Thanks H9! I always enjoy reading your thoughts. I'm sure I'll have a small fortune invested in tubes and X-over upgrades in the future.
    He he,One of the hazards of hanging around Club Polk
    SDA CRS+4.1TL's/Modded SDA 1C's/Modded SDA SRS 3.1TL's/Modded SDA SRS 2.3TL's

  18. #18

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    $1,600.00 for the Hera II premium tubes... OUCH!
    http://thetubestore.com/rogue-hera.html

    Quote Originally Posted by SolidSqual View Post
    Love Rogue gear. When I owned the non-Magnum version of this amp, I bought a tube package from the Tube Store: http://thetubestore.com/rogue-cronus.html

    I currently use a pair of Quicksilver amps and have the premium tube package selected by the Tube Store. Awesome. Way better than the stock tubes.
    Re-electing our politicians would be like chickens voting for Colonel Sanders

  19. #19

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    PM sent!

    Quote Originally Posted by headrott View Post
    Sending a PM. The Mullards are pretty pricey because they are relatively rare and they sound great. Usually around $110.00 a pair, but are worth it IMO. They are warm, smooth, have a large soundstage and make vocals really shine. They are not the end all be all in detail, but are very detailed. I highly recommend them. As I said, the Amperex 7316's are also very good. Better than the Mullards they are more detailed and not quite as warm sounding. They also have outstanding vocal reproduction! Overall just fantastic sounding throughout the sound spectrum. Absolutely one of the best 12AU7's and varients available.

    Greg

  20. #20

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    Quote Originally Posted by charley95 View Post
    PM sent!
    Not sure what happened, but I didn't recieve it.

    Greg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

  21. #21

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    Keep getting errors in the PM section. Can you just shoot me an e-mail.

    Thanks!
    sheridandunbar@comcast.net


    Quote Originally Posted by headrott View Post
    Not sure what happened, but I didn't recieve it.

    Greg

  22. #22

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    Amperex Bugle Boy or Phillips Holland PQ 12AU7 D getters or CBS Hytron 5814's are very good. 1962 or earlier Amperex Holland 7316's are going to be tough to beat.Siemens 12AU7 Nickel plates are also very good. all of the tubes i mentioned are very rare and very expensive. does anyone near you have any nice 12AU7's that you can try in your amp because it can save you a lot of time,money and effort.good luck....WCW III
    JAS Audio Bravo 2.3 SE Single ended Class A Tube Integrated Amplifier Svetlana 6C33-B triodes @ 18 wpc-Eastern Electric MiniMax DAC W-LME49990 op amps w Siemens 12AU7 -Black Cat Morpheus cables -Silverline Audio Sonata III

  23. #23

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    I just purchased a pair of clear tops from headrott. I'll start with those when I get my system up and running. Thanks for your input!
    Quote Originally Posted by W WALDECKER View Post
    Amperex Bugle Boy or Phillips Holland PQ 12AU7 D getters or CBS Hytron 5814's are very good. 1962 or earlier Amperex Holland 7316's are going to be tough to beat.Siemens 12AU7 Nickel plates are also very good. all of the tubes i mentioned are very rare and very expensive. does anyone near you have any nice 12AU7's that you can try in your amp because it can save you a lot of time,money and effort.good luck....WCW III

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