Specially, I could not locate the ICI LM308, so I changed it with CA3130. Likewise, I'd to exchange the transistor 2N5458 with NTE312. I suppose my dilemma lies in my inadequate option of alternatives for both transistor and ICI. Could anyone recommend some alternate options? On nearer examination, however, the https://edwinv234fbw0.homewikia.com/user