Tube Amp Archive

Thanks G

I didn't notice the note on the schem, so that's good to know my amp is set up right, cheers!

Have finally finished a 102 build which has probably taken a couple of years on and off. There is a lot of labour in these amps! And hours of research and help from you guys. It's my 4th amp build, and from power up yesterday, it actually worked straight off. I've never played another d style amp, b...

Marcus

Would be interesting to see the result of the Chinese kit, I've gotta say!

I think Modulus Amps, locally, do a kit too which is probably decent. Not sure how much £ it is though.

Brent

Interesting!

I wonder what the quality of the transformers would be?

5e3 is the my favourite amp and worth doing nicely. In the UK I used Hammond transformers via Bluebell, jupiter caps from Hificollective, Jensen P12Q speaker from Hotrox and the rest from mouser.

Just tried a few tubes I had which show difference in DC, taken pin 7 v1: Gold Lion standard: open -31mV, closed -0.7mV Electro Harmonix 12AX7EH: open -128mV, closed -9.5 JJ ECC83s: open -88mV, closed -3mV Sovtek LPS: open -64mV, closed -3mV Tungsol reissue: didn't record but similar to LPS. I had a...

Thanks - sounds like it was intentional after reading this post (very interesting): https://tubeamparchive.com/viewtopic.php?t=22254&highlight=rocket+preamp+tubes I'm getting -180mV which seems like a bit much though, so will try some tube rolling. The problem is I only have modern tubes to hand. Wh...

Hi all

I finished a rocket build a while back and I've notice that when I use this amp (compared with my other amps) that it makes the volume pot on my guitars scratchy when turning up or down.

Why would this be? DC?

Thanks!

The tone is rich and complex. I love the amp, the circuit is so much fun - for something simple if seems to have a big tonal range!

Yep, I was not a fan of the blues junior OD.

So went ahead and gutted the Blues Junior using the chassis and cab for a Tweed Deluxe build.

See pics

The bass pot resistor position change/tweak just prevents the mid/high frequency dive when the bass pot is at/near max.

Since the tweak you could say that there is less interaction from the bass control as this phenomenon no longer happens.

Can you explain this more: - Bass pot resistor/wiper. RJ suggested in one of his posts tweaking the tonestack on the bass control. When you max out the bass control the mid's take a huge dive. I removed one end of the resistor from the third leg of the pot and connected it to ground. This leaves on...

M Fowler wrote:I did a google search and came up with vendors?

http://www.vetco.net/catalog/product_in ... ts_id=4343

Thanks - I may look into that I think if the chained 5w zeners don't work out.

I did think about using one with an anode case and using a non-conductive (electrically) heat sink between it and the chassis - if such a heatsink exists? Regarding physics of materials: Most materials with high thermal conductivity are also good electrical conductors. Yeah, but I did some research...

I've just re-read your post Martin with the suggestion of a terminal strip. I think that's a great idea and will give it a try with something similar to this: http://www.screwfix.com/p/hylec-triple-pole-24a-steatite-ceramic-terminal-blocks-pack-of-5/26896?kpid=26896&cm_mmc=Google-_-Product%20Listing...

Yeah, it does seem very hard to find anything around with a cathode case. I did think about using one with an anode case and using a non-conductive (electrically) heat sink between it and the chassis - if such a heatsink exists? Martin; this is my current set up of 5x 5w 10v zeners on tag strips. I'...