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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 12th Jul 2019, 8:10 pm   #41
dekor8tor
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Default Re: Hacker GP42 and AL42 restoration help

Ok Frank i will change what Michael advises and do a re check
Many thanks
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Old 12th Jul 2019, 8:26 pm   #42
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Default Re: Hacker GP42 and AL42 restoration help

If you still have voltages that are a long way out after replacements are fitted. You could measure the cathode voltages of the pentodes, they are 1.4v and 4v at present. Swop the valves over, if the low voltages follow the valve then itís a sign that the valves are low emission.
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Old 12th Jul 2019, 9:20 pm   #43
dekor8tor
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Default Re: Hacker GP42 and AL42 restoration help

Hi Frank connected speaker and plug for stylus and checked voltages again this is what i got compared to last readings

HT1 C12 286V
HT2 C11 272V
HT3 C8 248V
V1A PIN9 164V
V2A PIN9 120V
V1B PIN6 265V
V2B PIN6 265V
V1A PIN2 0V
V2A PIN2 0V
V1B PIN 7 7.1V
V2B PIN7 7.2V
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Old 12th Jul 2019, 10:10 pm   #44
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Default Re: Hacker GP42 and AL42 restoration help

Voltages G3 = 257v on both
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Old 12th Jul 2019, 10:14 pm   #45
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Default Re: Hacker GP42 and AL42 restoration help

Those look more like they should do, have you changed any components but I would have expected pin 2 to have about 1v on them. The Pentode cathodes are about right so the emission is ok.
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Old 12th Jul 2019, 10:17 pm   #46
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Default Re: Hacker GP42 and AL42 restoration help

No all i have done is connect the speaker
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Old 12th Jul 2019, 10:18 pm   #47
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Default Re: Hacker GP42 and AL42 restoration help

So the voltages you took before were without the speaker or dummy load?
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Old 12th Jul 2019, 10:19 pm   #48
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Default Re: Hacker GP42 and AL42 restoration help

Yes
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Old 12th Jul 2019, 10:21 pm   #49
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Default Re: Hacker GP42 and AL42 restoration help

Oh well you will know for the future, the amplifier was probably going unstable.

So back to the problem, check those components that Micheal suggested.
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Old 12th Jul 2019, 10:24 pm   #50
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Default Re: Hacker GP42 and AL42 restoration help

Ok thanks will do
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Old 14th Jul 2019, 6:48 pm   #51
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Default Re: Hacker GP42 and AL42 restoration help

Incidentally a valve amplifier should never be run without either a loudspeaker or equivalent dummy load connected
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Old 21st Jul 2019, 10:12 pm   #52
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Default Re: Hacker GP42 and AL42 restoration help

Thanks for that livewire advice taken
Can anyone point me in the right direction for replacement rexine for the gondolier gp42 lid thanks
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Old 23rd Jul 2019, 9:20 pm   #53
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Default Re: Hacker GP42 and AL42 restoration help

you wont get either of the 2 colours that Hacker used
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Old 27th Jul 2019, 9:51 pm   #54
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Default Re: Hacker GP42 and AL42 restoration help

ok thanks brassbits i did have a look and like you said i dont think i will get any
thanks for replying
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Old 28th Jul 2019, 12:11 pm   #55
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Default Re: Hacker GP42 and AL42 restoration help

Hello can I ask why you want to replace the rexine on the lid, for example is it torn or frayed, or has it just discoulered/faded?
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Old 2nd Aug 2019, 10:09 pm   #56
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Default Re: Hacker GP42 and AL42 restoration help

Hi leslie i have a few woodworm holes in the lid
I have treated the casing with woodworm killer
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Old 3rd Aug 2019, 8:58 am   #57
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Default Re: Hacker GP42 and AL42 restoration help

With patience these (pre-treated) holes can be filled. If you use a hard soap like Imperial Leather (which comes in 2 colour shades) slightly soften it in warm water and then just rub this over the affected area. Any surplus can be skimmed off using the edge of a Stanley knife blade. It will then harden. All this may sound a bit fastidious I know, but it really does improve the appearence.
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Old 6th Aug 2019, 9:59 pm   #58
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Default Re: Hacker GP42 and AL42 restoration help

Thank you Edward i will give that a go
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Old 14th Aug 2019, 5:07 pm   #59
dekor8tor
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Default Re: Hacker GP42 and AL42 restoration help

Good afternoon everyone i just need a bit of advice on my 2 amps the one out of the gondolier and the one out of the al41
The amp in the gondolier has had the capacitors and resistors changed as advised by Michael Maurice and the other amp is untouched
The amp that has had the changes when all is connected back I have got a loud hum when the volume is turned up
Voltage across r6 is 78v and r7 is 113v on gp42
Voltage on untouched amp is r6 120v and r7 91v
Any help and advice will be greatly apprecciated thankyou
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Old 14th Aug 2019, 10:11 pm   #60
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Default Re: Hacker GP42 and AL42 restoration help

Hi all just anofher problem i put every thing back together plugged in the turntable and no power to turntable advice needed please
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