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Old 13th Aug 2019, 10:35 pm   #1
AD360 Rob
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Default Hacker Cavalier GP15 Circuit Diagram

Evening all, Just started on this player, it has a garrard AT6 mk2 deck. My question is, doe it use the same circuit as the Gondolier GP42? I can only find that one on Paul's DVD. (mine is the ECL86 variant) It's working to a degree but the output is VERY distorted and if the wick is turned up it will oscillate. I'm going through the amplifier as it has some of those horrible black plastic bodied electrolytics that are bound to need replacing.

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Rob
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Old 13th Aug 2019, 10:39 pm   #2
Herald1360
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Default Re: Hacker Cavalier GP15 Circuit Diagram

You'll likely find the GP15 info in one of the Yahoo Hacker groups' files. You'll need to register, but it's free.
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Old 13th Aug 2019, 11:11 pm   #3
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Default Re: Hacker Cavalier GP15 Circuit Diagram

I think there are minor differences, on the 15 the pentode anodes are fed directly from rect. cathode - via output transformer, and the cap associated with the bass control in the feedback loop has a different value, otherwise pretty much the same. Distortion may be due to grid coupling caps to the pentode sections being leaky. On the 42 these are always the reliable Mullard mustards but on most of the 15s I've seen they are Supamoulds and must be replaced

Last edited by electrogram; 13th Aug 2019 at 11:16 pm.
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Old 13th Aug 2019, 11:27 pm   #4
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Default Re: Hacker Cavalier GP15 Circuit Diagram

Quote:
Originally Posted by Herald1360 View Post
You'll likely find the GP15 info in one of the Yahoo Hacker groups' files. You'll need to register, but it's free.
I have just checked, the manual is in the Yahoo Hacker Audio Group courtesy of Mark, a UKVRRR forum member.
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Old 14th Aug 2019, 9:18 am   #5
AD360 Rob
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Default Re: Hacker Cavalier GP15 Circuit Diagram

I'll join up then, thanks chaps. I'll let you all know how it goes with this player (or should that be Reproducer?)
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Old 15th Aug 2019, 7:37 am   #6
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Default Re: Hacker Cavalier GP15 Circuit Diagram

Or you can download it from the Radio Museum. https://www.radiomuseum.org/r/hacker_cavalier_gp15.html

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Old 16th Aug 2019, 2:55 pm   #7
AD360 Rob
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Default Re: Hacker Cavalier GP15 Circuit Diagram

Afternoon everyone, got a circuit diagram, there's very little difference between the gp15 and gp42. Anyway I replaced most of the electrolytics (way off value and leaky) also the 2 grid coupling caps, checked all the resistors and they were all within tolerance so left them alone. Amp now is working properly, no hum, no distortion and voltages appear correct. It's running a lot cooler too so happy about that. Now to move on to the deck.. It's been abused (transit screws tightened so much they've pulled through the metal and spring cups detached) also the arm rest is broken. Does anyone have one? It's a garrard AT6 mk2? I'll also post this in the parts wanted section of the forum.

Rob
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Old 16th Aug 2019, 4:42 pm   #8
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Default Re: Hacker Cavalier GP15 Circuit Diagram

My mistake, it's not the spring mounts that have been pulled out, just the thread inserts for the transit screws (which is bad enough)
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Old Yesterday, 11:10 pm   #9
AD360 Rob
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Smile Re: Hacker Cavalier GP15 Circuit Diagram

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Originally Posted by AD360 Rob View Post
Now to move on to the deck.. It's been abused (transit screws tightened so much they've pulled through the metal and spring cups detached) also the arm rest is broken. Does anyone have one? It's a garrard AT6 mk2? I'll also post this in the parts wanted section of the forum.

Rob
After some exhaustive research (thanks google) I have found the arm rest is the same as the DECCADEC variant of the AT6 Mk2 and SP25. in case you're wondering, these decks were made by Garrard and had a modified arm so you could plug a Decca Deram cartridge straight into the arm. . . no headshell required ! Anyway I managed to find an arm rest on eBay so happy now
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