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Thread: NAD! '69-'70 Superstar Combo.....

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  1. #1

    NAD! '69-'70 Superstar Combo.....

    Actually, it's a Superstar Combo! Would some Moderator change the Title line for me???


    One very heavy amp, when I opened up the back panel, it had an early '70s Electro Voice SRO 15 speaker inside it! 26lbs! They call the speaker the 'coffee can' model.

    Nice RCA black-plate 6L6GC power tubes, a Telefunken dual triode tube for the phase inverter, and 4 Japanese Realistic 12ax7 preamp tubes. Oh, and a 6gw8 for the reverb unit. A lot like the '69 Thunderstar Combo I used to own.

    Found a schematic. Having a friend go through the amp. No foot switch, but a Fender switch will work.

    What kind of voltage should I be seeing on the plates? Where should I bias the 6L6s?

    Harry/gilded
    Last edited by gilded; 12-05-2017 at 09:18 PM.
    Quote Originally Posted by fronobulax View Post

    And I like Harry's approach.
    '66 Starfire I SB bass, '67 Mark IV pear wood, '75 Mark 4 P padauk, '00 Bluesbird black,
    '66 Thunderbird amp, '68 Thunder 1 RVT amp, '70 Superstar Combo

  2. #2
    Senior Member
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    You lucked out with the EV speakers. The basic stock ones are pretty poor sounding.
    M

  3. #3
    Quote Originally Posted by matsickma View Post
    You lucked out with the EV speakers. The basic stock ones are pretty poor sounding.
    M
    I hope so. It's pretty stupendous, though I did hear a small amount of noise when I played the A note on the low E string that I need to rule out as a speaker issue. I'm gonna take it to a speaker shop and have it checked out. I have a couple of other 15" speaks, but I don't think I can conceive of this amp with any other speaker right now.

    A friend played a really strong-sounding Ibanez string-thru hum-bucker guitar with it and the combination of that speaker and that guitar was remarkable.

    Sorry I don't have any pics. Thank you, Photobucket.
    Quote Originally Posted by fronobulax View Post

    And I like Harry's approach.
    '66 Starfire I SB bass, '67 Mark IV pear wood, '75 Mark 4 P padauk, '00 Bluesbird black,
    '66 Thunderbird amp, '68 Thunder 1 RVT amp, '70 Superstar Combo

  4. #4
    Quote Originally Posted by gilded View Post
    I hope so. It's pretty stupendous, though I did hear a small amount of noise when I played the A note on the low E string that I need to rule out as a speaker issue. I'm gonna take it to a speaker shop and have it checked out. I have a couple of other 15" speaks, but I don't think I can conceive of this amp with any other speaker right now.

    A friend played a really strong-sounding Ibanez string-thru hum-bucker guitar with it and the combination of that speaker and that guitar was remarkable.

    Sorry I don't have any pics. Thank you, Photobucket.


    Hello from Finland

    Among my other duties I also fix and recone speakers. Source of a "small amount of noise" in a combo amp could be any loose part anywhere in the cabin - as you surely are aware of. If you have ruled out other possibilities and pinpointed it to speaker, here´s what you can do before bringing it to local speaker shop. Pull the speaker out. If you have any regular pa-amp, connect it into that. Then you need oscillator - preferably one that goes down to 10Hz - mine goes down to 2Hz - continuously variable.

    Put the speaker on workbench - floor etc facing up - or hang it from ceiling. If there is a vent hole in back of magnet, it must remain free. Now feed it with low frequency signal. Watch out the cone movement. Do not exeed the limits - +/- 3mm or +/- 1/8inch will do for most speakers. Zoom the frequency to round 220Hz - low A on guitar - and listen if you can find the side noise. If it is a crack in the surround part, it will make very distinct sound once you hit the right frequency.

    Pumping air below audible frequencies is also good practice, while the audio is not covering small rubbing issues etc. So go down to as low you can and - watch the cone movement - listen, if the voice coil is rubbing or surround or center spider are producing noise.

    Sometimes the frame is slightly twisted - i.e. the amp got bumped hard. Then in some cases turning the speaker 180 degrees will flip the magnet weight to help.

    Cracks on cone and surround are easy to glue with white paper glue - simply rub the glue wit your finger so it goes inside the crack - usually no extra support pieces are needed.

    If the cone or spider is coming off the frame, then any contact glue is fine.

    Hope this helps.
    First good guitar - GUILD Duane Eddy 400 - I was 3rd owner - used to have Artist Award and Starfire
    Present guitars - F50R 1975 - F512 1977 - F212CSB 1979 - all bought new - B30SB fretless and RED Songbird bought secondhand - Schecter Startocaster - Gibson 3/4-size acoustic 1957 - Carmelo Gonzales nylon string - old Levin Lute

  5. #5
    Super Moderator fronobulax's Avatar
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    Quote Originally Posted by gilded View Post
    Actually, it's a Superstar Combo! Would some Moderator change the Title line for me???
    Done
    Quote Originally Posted by mgod View Post
    What he said.

    '67 Starfire I Bass (Cherry)
    '71 JS II Bass (Walnut)
    '82 B-50 Acoustic Bass (Natural)
    '87 Pilot (Black)
    '13 Newark Street Starfire Bass (Cherry)
    '16 Betts Bass "Walnut Bottom"

    LMG I, II, III

    This space available.

  6. #6
    Senior Member jp's Avatar
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    Congrats, Harry! Looking forward to pics. Those are the best-looking Guild amps, I think, with the two-color grill cloth and lots of shiny chrome :C)
    1959 T-100 DP
    1968 CE-100 DP
    1976 BluesBird M-75

  7. #7
    Thanks, JP. Glad you liked it. It's pretty clean for a player, but it's so heavy with the 25lb speaker that someone added folding handles on each side, so there are a lot of extra holes for a 'true collector'. Sounds great, though.

    I don't know what to tell you about pics. I'm walking away from Photobucket and I can't get a imgur account going for some reason.
    I guess I'll have to email pics to somebody and see if they want to post them.

    I should have it back in a couple of weeks.
    Quote Originally Posted by fronobulax View Post

    And I like Harry's approach.
    '66 Starfire I SB bass, '67 Mark IV pear wood, '75 Mark 4 P padauk, '00 Bluesbird black,
    '66 Thunderbird amp, '68 Thunder 1 RVT amp, '70 Superstar Combo

  8. #8
    Senior Member
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    Hey Gilded...by any chance does your amp have the script Guild chrome emblem, like used on early Thunder amps, on the upper right side, when looking at the amp from the front?
    The reason I am asking is because their is s old Guild advertisment with the a picture of the amp with a Starfire that has one of those script logos on the fron of the amp but I have never actually seen one on an amp for sale.

    I have considered adding on to the front of an amp.

    M

  9. #9
    matsickma, no, it does not have the logo.

    I'm trying to remember if my '69 Thunderstar 1x12 combo had the logo. I don't know that it did. I will check with the guy I gave it to and see if it has one. Give me a few days......

    Do you have a logo for the 'addition'?
    Quote Originally Posted by fronobulax View Post

    And I like Harry's approach.
    '66 Starfire I SB bass, '67 Mark IV pear wood, '75 Mark 4 P padauk, '00 Bluesbird black,
    '66 Thunderbird amp, '68 Thunder 1 RVT amp, '70 Superstar Combo

  10. #10
    Senior Member Walter Broes's Avatar
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    A 15" SRO is a great speaker for big, fat, clean guitar tones.

    -1960 CE100D
    -1961 Starfire III Special
    -1962 X175
    -1963X175
    -2011 F47R
    -2015 Newark Street X175 BLK

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