Sunvalley SV-S1645 - 45 Tube Amp - Available NOW

[vkung]

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​

Pre-order price $2,475.00 .​

After NOV 2023 $2,725 ( included development fee $250 per unit charged by Sunvalley)​

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WE expect it will take 8-9 months to complete the following processes. Please stay tuned....

1. Circuit approval - DONE
2. Prototype production - DONE
3. Prototype Evaluation - DONE
4. Prototype approval - DONE
5. Quote Approval - DONE
6. Mass production - WIP
7. Assembly _ Sept 2023
8. Characteristics Verification
9. Shipping jAN 2024
10. SCHEDULE ARRIVED Vancouver Feb 24, 2024

 

[Analogico]

2. output power 2W/5.2W 45/45B tube​

Hi Victor,

Will it be possible to switch between the Emission Labs 45 and 45B tubes, as previously planned?

 

[vkung]

The amp from Suvalley is based on 45 tube only..
You can use 45B but it will work as 45..

 

[KT]

Hi, Victor.

I'm assuming the amp will run only a 45, and not be switchable between 45 and 2A3?

Thanks!

 

[vkung]

we do not want to compromise the spec.
45 only...

 

[SPWONG]

Hi,
Do you have an option for the front panel without the volume?
Thanks.

 

[vkung]

you can modfy the kit by yourself

 

[nickng]

The amp from Suvalley is based on 45 tube only..
You can use 45B but it will work as 45..

Hi Victor, so correct to say no plan to offer one optimized for the 45b for 5.2W?

 

[vkung]

No only standard 45

 

[Hifihunter]

Hi Victor, so correct to say no plan to offer one optimized for the 45b for 5.2W?

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.

 

[vkung]

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

 

[vkung]

First Prototype will be avaiable in May 2023

 

[vkung]

KR 45 Tube








Emission 45 Tube

 

[vkung]

 

[Jandu]

 

[stretchneck]

Interested - as well as 45 can it take 10Y?

What’s the gain?

 

[vkung]

no only 45
no info at this time

 

[mp9]

Here is the info for the 45 amplifer from Sunvalley - SV-S1645D​

The composition of the vacuum tubes

45 X 2 (KR or Emission)​

​

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

 

[vkung]

I will stock Emission and KR for your choice
Of course you can buy your own NOS

 

[vkung]

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