Title imageTitle image

 Menu

 

 Information

4HR8 Pinout
basing pinout

 

4HR8 Substitutes
Close or identical 4CF8, PF86

Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.

 

4HR8 Ratings
Vh
V
Ih
A
VaMax
V
Vg2Max
V
PaMax
W
Pg2Max
W
Cgk
pF
Cak
pF
Cga
pF
4.5 0.3 300 200 1.0 0.2 3.5 5.0 0.05

 

4HR8 Application Data
Class Va
V
Vg2
V
Vg1
V
Ia
mA
Ig2
mA
Ra
Ω
S
mA/V
A 250 140 -2.0 3.0 0.6 2,500,000 2.0

 

4HR8 Data sheet links
oldradio.qrz.ru PF86: MK buizen handboek
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 4HR8: 2HR8.pdf (62767 bytes)  PF86: PF86.pdf (135086 bytes), PF86.pdf (284653 bytes) (cs), PF86.pdf (337095 bytes) (fr), PF86.pdf (85663 bytes)

Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Please see the substitutes at the top of the page for more details

All content on this page is copyright 1997-2026 Duncan Amplification Limited.

TDSL is advert free and is funded by voluntary donations. If you find the site useful, please consider making a small voluntary donation, thank you

Version: PHP release 1.16 22-Jan-2025