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Re: [Amps] 2K Classic X filament issue

Subject: Re: [Amps] 2K Classic X filament issue
From: Martin Sole <>
Date: Wed, 4 Aug 2021 17:52:58 +0300
List-post: <>
I'm with those who mentioned the socket clips. I had a similar problem on my 2K Classic X, full export, big transformer, ex UN (I'm told). A decent pair of pointed pliers should allow you to wriggle the clips off the socket pins. I swapped a couple of the grid pins with the two filament pins for both tubes and have not had a problem since.

My 2K also has the Johnson sockets and I'm not real impressed with them, especially with tubes than have the pin retaining ring. This blocks some of the socket holes and directs the airflow only through the centre spigot area and out across the pin seals. That might be a preferred solution but it seems it must be quite restrictive. I do have a pair of Chinese copy air-system style sockets, gifted to me by a very fine gentleman of this list, and once I have located the requisite "round tuit" I may fit them. I have a second 2K Classic that came to me as 90% complete and 20% messed with so they might go in that first to see before it gets the full 2x8877 conversion.

The big transformer allows about 3800v off load about 2kW out at full puff, staying within the Ia and Ig specs. I suspect these amps are even happier on 60Hz with cooler transformers and faster blowers.

Martin, HS0ZED

On 4/8/64 03:35, Donald Fox via Amps wrote:
Many thanks for the replies, both on and off list. I'll take a harder look at 
the socket pins and connections. This is my 3rd Classic series console with 
3-500's. The earlier 2 did not have such an issue.

I'll report back what I find.

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