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Hoffman Amps Forum image Author Topic: Debugging Customer's Botched 6G2 build - strange issue  (Read 1901 times)

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Offline fdesalvo

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Debugging Customer's Botched 6G2 build - strange issue
« on: March 01, 2022, 12:13:35 am »
Hi, all.Happy Monday. I'm almost finished debugging a customer's 6G2 clone and am down to two remaining issues:

1. Buzz when volume at 0 - 2 + tone at 0-9 or when volume is at 10 and tone is set anywhere below 10.  Buzz comes on and off like a light switch when moving volume or tone control.
2. Non functioning trem

My main concern is issue #1 at the moment. I found and corrected a host of assembly errors and now the amp is nearly silent, save a little hiss at volume, but there's buzz aplenty when the conditions of #1 are met. I can nearly silence it by touching V1B's grid wire with my finger. After running shielded cable here, no improvement was noted. Layout is mainly old school fender with a hoffman ground bus scheme at the pots. All tubes good. Issue disappears with V1 pulled.TIA
« Last Edit: March 01, 2022, 12:18:44 am by fdesalvo »
~F
"Ruining good moments since 1975."

Offline valvetones

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Re: Debugging Customer's Botched 6G2 build - strange issue
« Reply #1 on: March 01, 2022, 01:26:35 am »
Picture of the pot wiring on volume and tone and picture of the chassis top view would be helpful.

Loose solder / bad solder joints?

Offline Latole

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Re: Debugging Customer's Botched 6G2 build - strange issue
« Reply #2 on: March 01, 2022, 03:24:08 am »
Look a bad wiring dress

Show good pictures of the wiring

Offline owen

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Re: Debugging Customer's Botched 6G2 build - strange issue
« Reply #3 on: April 15, 2022, 06:45:29 pm »
agreed on lead dress. the first amp I built is a 6g2, and I had a similar noise issue at 0 on the volume pot. fingers nearby the leads to the tube sockets would alter noise characteristics.

i simply moved them around with a chopstick until noise free, and ultimately cut and soldered new wire in place. i was using cloth covered solid core, fyi.

the tremolo wiring is a crazy antenna, had many issues to sort out before I got it working quietly and perfectly. all were lead dress issues, surprisingly. ymmv.

Offline fdesalvo

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Re: Debugging Customer's Botched 6G2 build - strange issue
« Reply #4 on: April 15, 2022, 06:50:55 pm »
I forgot to close this out apologies. Too many issues, so I did the most efficient thing and rebuilt it.
~F
"Ruining good moments since 1975."

 


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