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December 06, 2022, 09:01:59 AM

Author Topic: Foreplay 3 extended kit Extremely loud popping  (Read 336 times)

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Offline Rob Capizzi

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Foreplay 3 extended kit Extremely loud popping
« on: December 19, 2021, 12:45:58 PM »
Hey what's up I am experiencing a very loud speaker popping when I turn on the 4 play 3 w extended kit. and when I turn it off.
 I have the bent audio volume control in it.
 I can also hear when I tap on the left tube through the speaker.

Offline Paul Birkeland

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #1 on: December 19, 2021, 12:59:46 PM »
I would suggest turning your amp on last and off first.  Regarding tapping the tube, you can move that tube to the center socket and the microphonic issues won't be so noticeable there.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #2 on: December 20, 2021, 04:53:23 AM »
Thanks for the tube swap tip. It seems that the tube is bad I see arching inside.  Is there a certain type I should replace these with? Brand wise. Is it a dual hybrid or something? Thanks.

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #3 on: December 20, 2021, 05:45:39 AM »
Should all three 12au7's be gain matched? Or 2 matched and one not?

Offline Paul Birkeland

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #4 on: December 20, 2021, 06:05:06 AM »
The outer pair of 12AU7s should be the same type, but the center can be different.  You do not need to pay for electrical matching.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #5 on: December 20, 2021, 06:07:22 AM »
Thanks! I found 3 matched new EH for 45 .

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #6 on: December 20, 2021, 06:12:47 AM »
I'm assuming the Paramount amps are fixed bias?

Offline Paul Birkeland

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #7 on: December 20, 2021, 06:14:19 AM »
They are cathode biased, with the caveat that the later revision has some adjustment for proper biasing in the 2A3 version of the amp.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #8 on: December 20, 2021, 06:58:07 AM »
Cool to know. 300b version here. Ty

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #9 on: December 20, 2021, 07:06:05 AM »
The tubes in my foreplay are 12au7a
Can I use the 12au7s I ordered?

Offline Paul Birkeland

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #10 on: December 20, 2021, 07:52:34 AM »
For the Foreplay circuit, there is no difference in functionality between a 12AU7 and a 12AU7A.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Rob Capizzi

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Re: Foreplay 3 extended kit Extremely loud popping
« Reply #11 on: December 20, 2021, 08:14:18 AM »
Great thanks!