[reg66]

Is that an fc (for footscray) under the little arrow? Looks more like a 'p' though so not sure...
EDIT: I have found that;
FE = STC Oldway
FB = STC Footscray
D = Mullard Mitcham
DA = Mullard Blackburn
Z = GEC Hammersmith

But, my 4033's say FD.... Well bugger me... FD = Rochester but these were sold on the forums here as Footscray. Bummer.

Here's what i found for any others wanting more info;
Code..... Manufacturer.................... UK Factory Location
KB/AD......Thorn-AEI (Brimar).........................Rochester
KB/D.......Mullard Radio Valve Co. .................. Mitcham
KB/DA......Mullard Radio Valve Co. ................. Blackburn
KB/F.......STC (Standard Telephone & Cable Co.).... Paignton
KB/FD......STC ........................................... Rochester
KB/FE......STC ........................................... Oldway
KB/FB......STC ........................................... Footscray
KB/N.......STC (before 1952)......................... Footscray
KB/K.......Electronic Tubes ........................... High Wycomb
KB/L.......M.O. Valve Co. (Before 1952)
KB/Z.......M.O. Valve Co. ............................. Hammersmith
KB/ZA......M.O. Valve Co. (Before early 1957).. Gateshead
KB/Q.......English Electric Valve Co. ............... Chelmsford
KB/R.......Ferranti ....................................... Moston

 

[ThurstonX]

Thanks. I actually have both those sites open already but looking at my CV4033's I can't see anything that resemnbles a date - is it possible they've rubbed off or am I looking in the wrong place!?

Also, do you know if Footscay produced tubes can only be varified by date or is the factory in the lettering?

Cheers fella

As far as I know you need to see the 'FB' to confirm it's from Footscray. The printed/painted lettering can easily rub off. The date codes should be longer lasting.

 

[ThurstonX]

Is that an fc (for footscray) under the little arrow? Looks more like a 'p' though so not sure...

Pretty sure it's the KB/FB to identify the factory. Can't recall off-hand the significance of the letters under the arrow (they vary, of course).

 

[reg66]

As far as I know you need to see the 'FB' to confirm it's from Footscray. The printed/painted lettering can easily rub off. The date codes should be longer lasting.

Yup, cheers fella. Have just edited my post... Looks like my advertised Footscray's are actually Rochester.

OK thanks guys

 

[ThurstonX]

Yup, cheers fella. Habe just edited my post... Looks like my advertised Footscray's are actually Rochester.

OK thanks guys

Rochester should be 'AD' or 'FD'.

Now I see your edit

 

[reg66]

Rochester should be 'AD' or 'FD'.

Now I see your edit

Yup, deffo says FD. Oh well, we live and learn!! Research before purchase lol

 

[jonathan c]

Pretty sure it's the KB/FB to identify the factory. Can't recall off-hand the significance of the letters under the arrow (they vary, of course).

It is KB/FB for the Footscray plant identifier.

 

[bcowen]

It is KB/FB for the Footscray plant identifier.

Yup....you immortalized that with this:

 

[AnalogEuphoria]

Anyone got experience with the 6SN7GT SYLVANIA green bad boy ?

 

[TheAbyss2022]

Hi all,

I just purchased the Schiit Lyr + with the premium option tube so I should receive that in a few days hopefully however, I also want to get another tube regardless of the price.

I am going to use it with the LCD 4 & HD800S

I would appreciate if someone could let me know what the best tube you have tried with the Lyr or a tube with the best resolution/holographic traits.

Thank you!

 

[chef8489]

Hi all,

I just purchased the Schiit Lyr + with the premium option tube so I should receive that in a few days hopefully however, I also want to get another tube regardless of the price.

I am going to use it with the LCD 4 & HD800S

I would appreciate if someone could let me know what the best tube you have tried with the Lyr or a tube with the best resolution/holographic traits.

Thank you!

My favorite tube so far was a 1952 foton 6n8s

 

[kpfeifle]

Hello All, quick question. I just purchased a lyr 3 and inserted a tube saver so my psvane tube fit. Also, I like the idea of a tube saver when the og tube socket is attached to a pc board. Question: how do you remove the tube saver without disassembling the case?

 

[Hyde00]

Hello All, quick question. I just purchased a lyr 3 and inserted a tube saver so my psvane tube fit. Also, I like the idea of a tube saver when the og tube socket is attached to a pc board. Question: how do you remove the tube saver without disassembling the case?

https://www.head-fi.org/threads/schiit-lyr-3-tube-rolling-thread.876016/page-336#post-17291204

Not sure if your socket saver work the same way but this is one idea lol.

 

[kpfeifle]

https://www.head-fi.org/threads/schiit-lyr-3-tube-rolling-thread.876016/page-336#post-17291204

Not sure if your socket saver work the same way but this is one idea lol.

Nice! Just what I needed, many thanks.

 

[TheAbyss2022]

Ladies and Gentlemen,

I present you with the Sylvania 6SN7GT VT231 3 Hole "Bad Boy".

I paid out the ass for this one but hopefully it will be worth it because I adore the Sylvania 6SN7GTB.