Many of the hermetic-seal dry-slug caps used by HP were Sprague 150D series. You can find catalog pages online here and there.
They also used some 109D wet-slug caps. Nasty when the seal fails, the acid can dissolve PCB traces. There's one in every 8552 spectrum analyzer IF module.
From: TekScopes@... <TekScopes@...> on behalf of Chuck Harris cfharris@... [TekScopes] <TekScopes@...>
Sent: Thursday, June 29, 2017 9:29 AM
Subject: Re: [TekScopes] General advice on replacement of old decoupling tantalum capacitors (by new tants or alum. lytics).
There are some premium, axially leaded, dry slug
capacitors available. They are in a steel case, and
have a glass seal on the "+" end. They always have
a prominent ball where the "+" lead is attached to
the glass seal. They last effectively forever, and
were once used in the space program. HP was quite
fond of them. They range from very small, about
3/32 inch diameter, through 1 inch diameter. Take
out a 2nd mortgage on your house if you want to buy