Tube Amp Network | YankeeDespot | Activity https://tubeampnetwork.com/members/yankeedespot/activity/ Activity feed for YankeeDespot. Thu, 22 Oct 2026 13:39:20 +0000 https://buddypress.org/?v= en-US 30 hourly 2 8c04afe63693e1ca26d0936abcbdb21c YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/page/2/#post-8427 Fri, 19 Mar 2021 15:12:47 +0000 Here’s what the PT is doing unhooked.

Checking continuity, between yellow wires, .6 ohm, between red, 331 ohm, green to green .3, so there’s no major shorts in there, but:

measuring ac voltage with a true rms dmm

Across green wires 6.79 vac, and across yellow 5.3. Is that right?   If those are half what they are supposed to be, could I run one…[Read more]

]]> 0 d20fecc4c9f613f593895008b2e0cf44 YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/page/2/#post-8424 Tue, 16 Mar 2021 14:50:26 +0000 I checked impedance of leads to OT, and there are no shorts. The ohm reading were what are to be expected.  I powered up with the primary connected and the red yellow grounded. Unconnected, across the leads(not to ground) I got 6.5vac for green wires; 5.15 vac across yellow, and 660 vac across red.

I always have the output to a speaker or an…[Read more]

]]> 0 ede47da8e2e40fc5aedf6a588aa305a2 YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/page/2/#post-8422 Sat, 13 Mar 2021 20:10:29 +0000 I recently moved to NE Arkansas, and a frequent conversation includes statements like “I lost my (wife, job, house, limb) from when I used to smoke methamphetamine.”  Never meth.

well, I don’t even have that excuse. So of course I had a found to the ground lug off one of the green wires, so now am getting 3.2 off of each green wire, and so each t…[Read more]

]]> 0 8015e5f884b55a1b0550416a5249cd48 YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/#post-8419 Sat, 13 Mar 2021 02:54:57 +0000 Update.  I have dc voltages on the filter caps that look ok, at 376,338,and 241 big to small. DC

On a 6V6 there’s 373vdc at pin 3, and 340vdc on pin 4 with 122 vac from my variac  so that’s all high, but there’s hum to the speaker now, that doesn’t change with volume or tone, and  scratching sounds from the speaker when the tube pins are probed.…[Read more]

]]> 0 893ca79751c719d98690806b171de04f YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/#post-8411 Wed, 10 Mar 2021 17:19:05 +0000 I promise I’m not stupid, but I am left handed. I looked at the diagram from the perspective of outside, so all my tube wiring was backwards. Yikes. I’ve used the lightbulb and a variac, so hopefully we’ll be ok. I’ll rewire it, and check grounds and cross fingers and toes.
Thank you all for the assistance. I make pretty good acoustic guitars…[Read more]

]]> 0 5d00722d11123b7b3b074718b10a1d3f YankeeDespot replied to the topic Please help me finish this project! in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/please-help-me-finish-this-project/#post-8392 Thu, 04 Mar 2021 01:02:07 +0000 Howdy. I’m not a moderator or expert, but I don’t see why you’d need the switch, assuming you use one tube/ speaker combo. Page 188 of the old book has the output info for the wires from the OT.
You may want to use the Contact form to get the mod to see your post. That’s what I did, and they got right back to me.

Doug

]]> 0 edc486e1aee07d2188d2b13296f26731 YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/#post-8389 Mon, 01 Mar 2021 15:25:03 +0000 Andy,

I’ll go back through it, check the values and grounds, and let you know. I ordered another tube, so I’ll have that option/ diagnostic tool as well. I’m learning a lot, as I guess all new builders do. I just don’t know what I don’t know. I’ve got questions on the impedance switch, but will try to get it running first.
Thanks for the hel…[Read more]

]]> 0 6aa5704092725da2f26ce6159f1c1cea YankeeDespot replied to the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/#post-8386 Sun, 28 Feb 2021 19:45:49 +0000 Hi,
I think we’re mostly on the same page. I have the center tap done, and my low voltage ac is ok. The problem is that there’s 330ac on the yellow wires going into rectifier tube pins 2&8, but no power coming out of pin 8 to the first filter cap. I have a white cloth covered wire going from pin 8 to the first cap and on the same post, the 5w/…[Read more]

]]> 0 effaf399a09404b9ea0ba6ab78543435 YankeeDespot started the topic Older kit, need coherent instructions in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/older-kit-need-coherent-instructions/ Wed, 24 Feb 2021 17:30:37 +0000 Howdy,
I bought the 2 stroke kit here years ago, and am now just getting around to building. I know some parts are different from the book,(which I have of course), but the supplied addendum is incomplete or wrong. In the discussion of the new PT, he seems to mean the OT, and none of the descriptions of the PT match what I have. Mines closest to…[Read more]

]]> 0 a40da56a2a83ab6998ced44ff354d4ab YankeeDespot started the topic Brass plate on pg 191 pp6 in the forum 2 Stroke Amplifier Design and Building https://tubeampnetwork.com/forums/topic/brass-plate-on-pg-191-pp6/ Tue, 23 Aug 2016 20:09:50 +0000 Hi
I’m building my first amp, and it’s going fairly well, but this section of the book has me baffled. I don’t even know what question to start with. Here goes: the kit seems not to have a brass plate, and so how will I accomplish the rest of pp 6 instructions?
Also, and scarily ” now solder the ground connection from output tube….” I see in…[Read more]

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