Originally Posted by ericr
In my MHDT DAC the GE tubes are OK. They must have made a huge number of these as almost every tube vendor has them still. The nice thing is they are inexpensive.
From what I've read H&K did not manufacturer tubes, but rebranded much like Magnavox, Zenith, etc. If you can post some pictures or a link we may be able to identify them for you.
Even though I'm a huge fan of Sylvania tubes their 5670 (even the Gold Brand) are not on my favorites list.
1) Bendix JAN CEA 2C51 / 5670
Getting hard to find and can be costly.
Often printed with Eclipse Pioneer rather than Bendix
2) Western Electric 396a / 2C51
3) Hytron JHY 5670 / 2C51
Can be hard to find, but I have bought a few inexpensively.
May also be branded CBS (they bought Hytron), but needs to have two posts holding the getter. The later CBS with one post are not as good.
?) Tesla 6CC42 pinched waist
Hard to find, especially here in USA.
I've not heard these but some say the are as good or better than the Bendix or WE.