GZ34/5AR4 - Amperex - Super Rare F31 1958 HH Scott Version

You will receive the exact tube pictured

Test Results on TV-7:

59/40

58/40

Manufacturer & origin

• Made by Amperex
• Built at the Heerlen, Holland Philips factory
• Re-branded for H.H. Scott (very common and very legit)
• Original Amperex yellow/green box

Scott didn’t buy junk tubes—this is the same tube as a label-branded Amperex.

Glass markings

• “GZ34 / 5AR4” → tube type
• “MADE IN HOLLAND” → correct factory
• Faint etched codes near the base → production codes

Box label (important)

• Tube type: 5AR4
• Brand: Scott
• Manufacturer: Amperex
• Production year: 1958
• Brent Jessee label as I bought this from him

This is a classic early Philips-family GZ34, which means:

• Low internal resistance (excellent voltage regulation)
• Robust plate structure
• Long service life (often 10,000+ hours in sane circuits)

Later GZ34s and many modern versions do not behave the same way and have a MUCH shorter useful life.

Sonic & electrical character

Rectifiers do influence feel, even if indirectly.

Typical Amperex/Philips GZ34 traits:

• Tight, controlled bass
• Excellent dynamic tracking
• Neutral tonal balance
• Slightly firmer presentation than Mullard
• Less “romantic bloom,” more authority and control