Here is the info for the 45 amplifer from Sunvalley - SV-S1645D
The composition of the vacuum tubes:12AT7 x1 or 12AX7
12AU7 X 2
45 X 2
274B/5U4G (tube rectifier only)
Output transformer Hashimoto H20-7U.
Choke and Power Transformer 115/230V custom made
Made and Assembled by Sunvalley Japan with 4 x VCAP ODAM (0.1 X 2 + 0.22 X 2)
Available in February 2024 - Only 25 units for the 1st production
Price : $2,725 ( included development fee $250 per unit charged by Sunvalley)
[
[URL='https://flic.kr/p/2oPzp7X']
WE expect it will take 8-9 months to complete the following processes. Please stay tuned....
- Circuit approval - DONE
- Prototype production - DONE
- Prototype Evaluation - DONE
- Prototype approval - DONE
- Quote Approval - DONE
- Mass production - WIP
- Assembly _ Sept 2023
- Characteristics Verification
- Shipping jAN 2024
- SCHEDULE ARRIVED Vancouver Feb 24, 2024
Last edited:
Hi Victor,
Will it be possible to switch between the Emission Labs 45 and 45B tubes, as previously planned?
Hi, Victor.
I'm assuming the amp will run only a 45, and not be switchable between 45 and 2A3?
Thanks!
I'm assuming the amp will run only a 45, and not be switchable between 45 and 2A3?
Thanks!
I did notice that it appears to be using a 5u4g rectifier, which I like. If you wanted higher plate voltage and more current flowing you could use a 5ar4. After some tinkering around with power supply resistors and cathode resistors you might have something that could work well with the EML 45B. So I hope the design sticks with the 5u4g.
This is the plan. The design team from Sunvalley will make the final decision.
The tube set is confirmed
12AX7 X 1 + 12AU7 X 2 + 5U4G/274B + 45 (only)
Coupling cap 0.1 X 2 + 0.22X2
The tube set is confirmed
12AX7 X 1 + 12AU7 X 2 + 5U4G/274B + 45 (only)
Coupling cap 0.1 X 2 + 0.22X2
What is the current availability situation of New Production 45 tubes?
Google search is not coming up with much, many of the new production offerings available just 5 to 10 years ago appear to have been discontinued and unobtainable new.
It would appear 45 tube has fallen out of favor, perhaps not profitable enough, 😔
KR audio website does not list 45 tube.
Sophia Electric used to offer a few different 45 tube options, now nothing on their website
I will stock Emission and KR for your choice
Of course you can buy your own NOS
Of course you can buy your own NOS
There is no issue to get Emission and KR
I will stock 45 before the release of SV 1645
I already ordered few pairs to Japan to do testing and evaluation
I have few pairs of NOS National 45 too
I will stock 45 before the release of SV 1645
I already ordered few pairs to Japan to do testing and evaluation
I have few pairs of NOS National 45 too
Last edited: