Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Other Topics => Topic started by: mresistor on January 14, 2018, 08:38:24 am

Title: Fake Siemens GZ34 is actually mis-labeled Russian 5C4M
Post by: mresistor on January 14, 2018, 08:38:24 am

GZ34 ?    Do these look like GZ34's ?  They look like 5Y3s to me because they are Russian 5C4M .


https://www.ebay.com/itm/2x-SIEMENS-MULLARD-GZ34-5AR4-ROHRE-NEU-IN-OVP-NOS-/322995819726? (https://www.ebay.com/itm/2x-SIEMENS-MULLARD-GZ34-5AR4-ROHRE-NEU-IN-OVP-NOS-/322995819726?)

Title: Re: GZ34 ??
Post by: mresistor on January 14, 2018, 11:25:18 am

Pretty sure these are mis-labeled Russian military 5C4M/5U4M rectifiers.   Definitely not Mullard GZ34s like the seller says and not even new production Mullards. I have a USSR Sovtek 5U4M that is labeled as a 5Y3 that looks exactly like these.  They are closer to a 5V4 than a 5Y3 and also appear to be directly heated. Pity the 3 people that actually bought these thinking they are GZ34.

http://www.nostubestore.com/2012/01/russian-nos-gz34.html (http://www.nostubestore.com/2012/01/russian-nos-gz34.html)   


 

Title: Re: Fake Mislabeled GZ34 is actually Russian 5C4M
Post by: mresistor on January 28, 2018, 09:05:47 am

Here are some being sold under National Brand labeled as 5AR4 but they are the Russian 4-pin 5C4M .  The details that give it away are 4 pins - round glass top - the flying saucer getter - 2 support rods - and different shaped mica spacer at the top of the plates. 

https://www.ebay.com/itm/263463293708?ul_noapp=true (https://www.ebay.com/itm/263463293708?ul_noapp=true)

Title: Re: Fake Mislabeled GZ34 is actually Russian 5C4M
Post by: mresistor on January 28, 2018, 09:07:38 am

compare to   https://www.ebay.com/itm/New-2-x-5C4M-CV186-5Z4-GZ32-5AR4-GZ34-Rectifier-tubes-70-s-/172137457103

Title: Re: Fake Mislabeled GZ34 is actually Russian 5C4M
Post by: mresistor on January 28, 2018, 09:16:27 am

pic of fake