Hello Martyn, This amp project looks very interesting particularly because of the use of "alternative" valve types. Not to through a spanner in the works but if you have another 30P12 would you consider making it a parallel single ended output. Working with an anode voltage of 250V and an 8 ohm load, the Black - Yellow winding would suit or with a 16 ohm load the Black - White winding. The latter utilizes the whole of the primary winding which would help maximize power transfer. Both secondary windings on your power transformer would easily cope. Also, by loading the windings closer to their current rating it may help to keep the voltages in spec, particularly the heater. You may have progressed too far into the build to change now but it was just a thought. Regards, Jeff.
The units I bought were the 2C23T which has the same feature set, in a DMM format with a smaller screen and physical buttons. While it's not the most accurate nor can it be called feature-rich, it's great for the hobbyist like I who has been servicing his own amps as well as other electrical and electronic gear for the last 40-something years and truly unbeatable for $99 USD. It puts a scope in the hands of someone who could never justify the purchase of one. Very intuitive to use and quite frankly a lot of fun for those who can appreciate it. So far, mine is impressing but that's partially due to my low expectations. The documentation doesn't tell you any more than what 20 minutes of tinkering won't uncover. It does function, it's more than just a toy - just not a piece of precision test gear. It gets you in the ballpark. All cables included. Great bang for the buck!
The Flying Haggis, I love the name, I remember I was helping teach an American Fiddle Styles workshop over in Glasgow Scotland some 20yrs ago and was told all about Haggis when I arrived. I passed on the offer to try it lol 😂🤣😂🤣. My stomach wasn’t feeling adventurous that day. That new pocket friendly meter looks to be the bomb. I think I might have to get one of those. Cheers my friend, I hope all is well with you..🎻🎸🎻🎸
Hello David. I haven't tried it either. The scope on this unit works really well. It's a good tool to have. I am good thank you. Hope you are too. Take care david
Wow.. this is very curious. I used this website a few years ago and it then sort of disappeared. The version you found has a slightly different URL and has a different selection of projects. Hmm.. Anyway, before the original site disappeared I downloaded a bunch of schematics including the Hi Octane and the one I have appears to be a later revision - I'm not sure there is much difference except it uses more modern component values eg 47uF caps rather than 50uF etc. If you are interested I'd be happy to share the ones I have. I built an amp called the Single Ended Lead from the original AX84 site, essentially the same preamp but with a KT88 as the output valve. I actually used a 6550 (I got given some). The amp is very bright but surprisingly quiet noise-wise for a single ended amp, I was quite impressed. A good basis for experimentation I think!
You might want to be careful with the Ecc85 swap possibility, I just had a look and the max cathode voltage Is 90V compared to 180V on a 12AX7, the cathode follower is showing 145V on that schematic
Hello Martyn, This amp project looks very interesting particularly because of the use of "alternative" valve types. Not to through a spanner in the works but if you have another 30P12 would you consider making it a parallel single ended output. Working with an anode voltage of 250V and an 8 ohm load, the Black - Yellow winding would suit or with a 16 ohm load the Black - White winding. The latter utilizes the whole of the primary winding which would help maximize power transfer. Both secondary windings on your power transformer would easily cope. Also, by loading the windings closer to their current rating it may help to keep the voltages in spec, particularly the heater. You may have progressed too far into the build to change now but it was just a thought. Regards, Jeff.
Hello Jeff, That's a great idea. I have not started it yet. I will have a dig through the tube stash for another 30P12. Take care Jeff.
The units I bought were the 2C23T which has the same feature set, in a DMM format with a smaller screen and physical buttons. While it's not the most accurate nor can it be called feature-rich, it's great for the hobbyist like I who has been servicing his own amps as well as other electrical and electronic gear for the last 40-something years and truly unbeatable for $99 USD. It puts a scope in the hands of someone who could never justify the purchase of one. Very intuitive to use and quite frankly a lot of fun for those who can appreciate it. So far, mine is impressing but that's partially due to my low expectations. The documentation doesn't tell you any more than what 20 minutes of tinkering won't uncover. It does function, it's more than just a toy - just not a piece of precision test gear. It gets you in the ballpark. All cables included. Great bang for the buck!
Hello Rico. I will have a look at that model. Take care.
The Flying Haggis, I love the name, I remember I was helping teach an American Fiddle Styles workshop over in Glasgow Scotland some 20yrs ago and was told all about Haggis when I arrived. I passed on the offer to try it lol 😂🤣😂🤣. My stomach wasn’t feeling adventurous that day. That new pocket friendly meter looks to be the bomb. I think I might have to get one of those. Cheers my friend, I hope all is well with you..🎻🎸🎻🎸
Ach ye dinny ken whit ye’ve missed. It’s a great delicacy in Scotland. 😉😉
Hello David. I haven't tried it either. The scope on this unit works really well. It's a good tool to have. I am good thank you. Hope you are too. Take care david
Hello John. I take it you have tried it?
@@vintageguitaramp_guitarteacher Aye of course Martyn . I was born in Scotland, was ten when we moved to Ilkeston in 1966. Now living in Derby 👍👍
Martyn, those tv valves are pretty rugged. The heat and voltages in a tv were far greater than the demands you will put them under in a guitar amp.
Hello Mark. They are. It's hard to know how far to push them as nobody as tried before as far as I know. Take care.
Wow.. this is very curious. I used this website a few years ago and it then sort of disappeared. The version you found has a slightly different URL and has a different selection of projects. Hmm.. Anyway, before the original site disappeared I downloaded a bunch of schematics including the Hi Octane and the one I have appears to be a later revision - I'm not sure there is much difference except it uses more modern component values eg 47uF caps rather than 50uF etc. If you are interested I'd be happy to share the ones I have. I built an amp called the Single Ended Lead from the original AX84 site, essentially the same preamp but with a KT88 as the output valve. I actually used a 6550 (I got given some). The amp is very bright but surprisingly quiet noise-wise for a single ended amp, I was quite impressed. A good basis for experimentation I think!
Hello SJ. That sounds like a great amp. I would be grateful if sent me the schematics you have, thank you. Do you have any pics of the amp you built?
@@vintageguitaramp_guitarteacher sent to the email address in the channel info.
You could try the Hammond 1760C as it has 2 primaries to choose from, could be a better match when dialed in
Hello Steve, thank you. I will take a look at that one. Take care.
Nice toys! Video/mic very hummy though... Still, take care! Brett
Hello Brett. I have to try another mic on the camera. I have a small advert video to record. I will try that on a different camera. Take care.
You might want to be careful with the Ecc85 swap possibility, I just had a look and the max cathode voltage Is 90V compared to 180V on a 12AX7, the cathode follower is showing 145V on that schematic
Hello Steve, thank you. That's a good spot. You are right. That might be a problem. Thanks for you input and supporting the channel. Take care.
What’s an ohm or two between friends ? 😂
Hello John. Exactly. Take care.