If you would like to try a few different types that are really good and relatively inexpensive, I’ll list some options. Question for you what amp are you using?
Is it a Lyr, or something else?
recommendations:
For 396A/6N3P/2C51/5670 etc. variants
Foton 6N3P or Reflektor 6N3P 50’s era. Both of these are good tubes that can normally be found for reasonable prices. The Foton 6N3P 50’s era sound a little better then the Reflektor, to my ear. For these tubes check with members here first like TK16 and second choice would be eBay.
If you want to try other variants of tubes such as 12AU7 or 12AT7 variants I would recommend these tubes:
For 12AU7 variants IMHO probably one of the best ‘bang for your buck’ would be
Baldwin Raytheon 12AU7 long shiny black plates, these can normally be found for around $25 for a pair, on eBay.
Further recommendations for 12AU7 variants that you can purchase from the well respected company Tubemonger are as follows:
- Brimar ECC82 1970s HALO-DISC Getter Short Plate Mazda LABEL - Thorn-AEI - England https://www.tubemonger.com/MINT_NOS_BRIMAR_ECC82_12AU7_1970s_HALO_DISC_GT_p/1236.htm
- Tesla (NOT JJ) 1975-82 Military Long PL. ECC802S prem. https://www.tubemonger.com/Tesla_NOT_JJ_MINT_NOS_1975_82_ECC802S_Tall_PLCZ_p/1012.htm
For 12AT7 variants, that you can purchase from Tubemonger
- Brimar CV4033 Military Black Plate Prem. Grade Long Life ECC81/CV4024/12AT7 Halo Getter STC Prod England 1960-62 https://www.tubemonger.com/Brimar_CV4033_NOS_1960_62_Prem_CV4024_STC_Eng_SLIM_p/2042m-sl.htm
- Siemens & Halske E81CC - 1960s 3-MICA 6201 Munich W. German Prem. ECC81 12AT7 https://www.tubemonger.com/Siemens_Halske_1960s_3_MICA_E81CC_Munich_ECC81_p/629m.htm
All of the above tubes I recommend are tubes that I own and have been very happy with.
Further recommendations would be for Socket Savers if you do not already have some, as these will protect the sockets in your amp for tube rolling.
My recommendation would be Tubemonger’s socket savers as most of us here use these, (very well built and have the added benefit of helping to reduce noise on tubes that are microphonic because of their vibration resistant bases). Tubemonger also makes 12A*7 to ECC88/6922 adapters (highly recommended as these are also extremely well built and have the same vibration resistant bases as their socket savers.)
Tubemonger Socket savers
https://www.tubemonger.com/NOVIB_Socket_Saver_1960s_NOS_British_McMurdo_B9A_p/novib-mcmurdo.htm
Tubemonger adapters 12A*7 to ECC88/6922 basses
https://www.tubemonger.com/12Axx_to...IB_1960s_p/12axx-ecc88-adap-novib-mcmurdo.htm
Hope this information helps